diff --git a/pkgs/applications/audio/deadbeef/plugins/infobar.nix b/pkgs/applications/audio/deadbeef/plugins/infobar.nix
deleted file mode 100644
index 3f62e73e7e469..0000000000000
--- a/pkgs/applications/audio/deadbeef/plugins/infobar.nix
+++ /dev/null
@@ -1,34 +0,0 @@
-{ lib, stdenv, fetchurl, pkg-config, deadbeef, gtk3, libxml2 }:
-
-stdenv.mkDerivation rec {
-  pname = "deadbeef-infobar-plugin";
-  version = "1.4";
-
-  src = fetchurl {
-    url = "https://bitbucket.org/dsimbiriatin/deadbeef-infobar/downloads/deadbeef-infobar-${version}.tar.gz";
-    sha256 = "0c9wh3wh1hdww7v96i8cy797la06mylhfi0880k8vwh88079aapf";
-  };
-
-  nativeBuildInputs = [ pkg-config ];
-  buildInputs = [ deadbeef gtk3 libxml2 ];
-
-  buildFlags = [ "gtk3" ];
-
-  installPhase = ''
-    runHook preInstall
-
-    mkdir -p $out/lib/deadbeef
-    cp gtk3/ddb_infobar_gtk3.so $out/lib/deadbeef
-
-    runHook postInstall
-  '';
-
-  meta = with lib; {
-    broken = true; # crashes DeaDBeeF and is abandoned (https://bitbucket.org/dsimbiriatin/deadbeef-infobar/issues/38/infobar-causes-deadbeef-180-to-crash)
-    description = "DeaDBeeF Infobar Plugin";
-    homepage = "https://bitbucket.org/dsimbiriatin/deadbeef-infobar";
-    license = licenses.gpl2Plus;
-    maintainers = [ maintainers.jtojnar ];
-    platforms = platforms.linux;
-  };
-}
diff --git a/pkgs/applications/graphics/rapcad/default.nix b/pkgs/applications/graphics/rapcad/default.nix
deleted file mode 100644
index 904c9f8f40257..0000000000000
--- a/pkgs/applications/graphics/rapcad/default.nix
+++ /dev/null
@@ -1,34 +0,0 @@
-{ lib, stdenv, fetchFromGitHub, fetchurl, cgal, boost, gmp, mpfr, flex, bison, dxflib, readline
-, qtbase, qmake, libGLU
-}:
-
-stdenv.mkDerivation rec {
-  version = "0.9.8";
-  pname = "rapcad";
-
-  src = fetchFromGitHub {
-    owner = "gilesbathgate";
-    repo = "rapcad";
-    rev = "v${version}";
-    sha256 = "0a0sqf6h227zalh0jrz6jpm8iwji7q3i31plqk76i4qm9vsgrhir";
-  };
-
-  patches = [
-    (fetchurl {
-      url = "https://github.com/GilesBathgate/RapCAD/commit/278a8d6c7b8fe08f867002528bbab4a6319a7bb6.patch";
-      sha256 = "1vvkyf0wg79zdzs5zlggfrr1lrp1x75dglzl0mspnycwldsdwznj";
-      name = "disable-QVector-qHash.patch";
-    })
-  ];
-
-  nativeBuildInputs = [ qmake ];
-  buildInputs = [ qtbase cgal boost gmp mpfr flex bison dxflib readline libGLU ];
-
-  meta = with lib; {
-    license = licenses.gpl3;
-    maintainers = [ maintainers.raskin ];
-    platforms = platforms.linux;
-    description = "Constructive solid geometry package";
-    broken = true; # 2018-04-11
-  };
-}
diff --git a/pkgs/applications/misc/multibootusb/default.nix b/pkgs/applications/misc/multibootusb/default.nix
deleted file mode 100644
index 403df853343c3..0000000000000
--- a/pkgs/applications/misc/multibootusb/default.nix
+++ /dev/null
@@ -1,115 +0,0 @@
-{ fetchFromGitHub, libxcb, mtools, p7zip, parted, procps, qemu, unzip, zip,
-  coreutils, gnugrep, which, gnused, e2fsprogs, autoPatchelfHook, gptfdisk,
-  python3Packages, qt5, runtimeShell, lib, util-linux, wrapQtAppsHook }:
-
-# Note: Multibootusb is tricky to maintain. It relies on the
-# $PYTHONPATH variable containing some of their code, so that
-# something like:
-#
-# from scripts import config
-#
-# works. It also relies on the current directory to find some runtime
-# resources thanks to a use of __file__.
-#
-# https://github.com/mbusb/multibootusb/blob/0d34d70c3868f1d7695cfd141141b17c075de967/scripts/osdriver.py#L59
-
-python3Packages.buildPythonApplication rec {
-  pname = "multibootusb";
-  name = "${pname}-${version}";
-  version = "9.2.0";
-
-  nativeBuildInputs = [
-    wrapQtAppsHook
-    autoPatchelfHook
-    unzip
-    zip
-  ];
-
-  runTimeDeps = [
-    coreutils
-    gnugrep
-    which
-    parted
-    util-linux
-    qemu
-    p7zip
-    gnused
-    mtools
-    procps
-    e2fsprogs
-    gptfdisk
-  ];
-
-  buildInputs = [
-    libxcb
-    python3Packages.python
-    qt5.full
-  ];
-
-  src = fetchFromGitHub {
-    owner = "mbusb";
-    repo = pname;
-    rev = "v${version}";
-
-    sha256 = "0wlan0cp6c2i0nahixgpmkm0h4n518gj8rc515d579pqqp91p2h3";
-  };
-
-  # Tests can't run inside the NixOS sandbox
-  # "Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory"
-  doCheck = false;
-
-  pythonPath = with python3Packages; [
-    dbus-python
-    pyqt5
-    pytest-shutil
-    pyudev
-    six
-  ];
-
-  # multibootusb ships zips with various versions of syslinux, we need to patchelf them
-  postPatch = ''
-    for zip in $(find . -name "*.zip"); do
-      zip=$(readlink -f $zip)
-      target="$(mktemp -d)"
-      pushd $target
-      unzip $zip
-      rm $zip
-      autoPatchelf .
-      zip -r $zip *
-      popd
-    done
-  '';
-
-  postInstall = ''
-    # This script doesn't work and it doesn't add much anyway
-    rm $out/bin/multibootusb-pkexec
-
-    # The installed data isn't sufficient for whatever reason, missing gdisk/gdisk.exe
-    mkdir -p "$out/share/${pname}"
-    cp -r data "$out/share/${pname}/data"
-  '';
-
-  preFixup = ''
-    makeWrapperArgs+=(
-      # Firstly, add all necessary QT variables
-      "''${qtWrapperArgs[@]}"
-
-      # Then, add the installed scripts/ directory to the python path
-      --prefix "PYTHONPATH" ":" "$out/lib/${python3Packages.python.libPrefix}/site-packages"
-
-      # Add some runtime dependencies
-      --prefix "PATH" ":" "${lib.makeBinPath runTimeDeps}"
-
-      # Finally, move to directory that contains data
-      --chdir "$out/share/${pname}"
-    )
-  '';
-
-  meta = with lib; {
-    description = "Multiboot USB creator for Linux live disks";
-    homepage = "http://multibootusb.org/";
-    license = licenses.gpl2;
-    maintainers = []; # Looking for a maintainer!
-    broken = true; # "name 'config' is not defined", added 2021-02-06
-  };
-}
diff --git a/pkgs/development/libraries/libdap/default.nix b/pkgs/development/libraries/libdap/default.nix
deleted file mode 100644
index 8eacd9706a880..0000000000000
--- a/pkgs/development/libraries/libdap/default.nix
+++ /dev/null
@@ -1,23 +0,0 @@
-{ lib, stdenv, fetchurl, bison, libuuid, curl, libxml2, flex }:
-
-stdenv.mkDerivation rec {
-  version = "3.20.6";
-  pname = "libdap";
-
-  nativeBuildInputs = [ bison flex ];
-  buildInputs = [ libuuid curl libxml2 ];
-
-  src = fetchurl {
-    url = "https://www.opendap.org/pub/source/${pname}-${version}.tar.gz";
-    sha256 = "0jn5bi8k2lq6mmrsw7r1r5aviyf8gb39b2iy20v4kpkj5napzk1m";
-  };
-
-  meta = with lib; {
-    description = "A C++ SDK which contains an implementation of DAP";
-    homepage = "https://www.opendap.org/software/libdap";
-    license = licenses.lgpl2;
-    maintainers = [ maintainers.bzizou ];
-    platforms = platforms.linux;
-    broken = true;
-  };
-}
diff --git a/pkgs/development/libraries/openbr/default.nix b/pkgs/development/libraries/openbr/default.nix
deleted file mode 100644
index 8e56e250ac405..0000000000000
--- a/pkgs/development/libraries/openbr/default.nix
+++ /dev/null
@@ -1,27 +0,0 @@
-{ lib, stdenv, fetchFromGitHub, cmake, opencv, qtbase, qtsvg }:
-
-stdenv.mkDerivation {
-
-  version = "0.5";
-  pname = "openbr";
-
-  src = fetchFromGitHub {
-    owner = "biometrics";
-    repo = "openbr";
-    rev = "cc364a89a86698cd8d3052f42a3cb520c929b325";
-    sha256 = "12y00cf5dlzp9ciiwbihf6xhlkdxpydhscv5hwp83qjdllid9rrz";
-  };
-
-  buildInputs = [ opencv qtbase qtsvg ];
-
-  nativeBuildInputs = [ cmake ];
-
-  meta = {
-    description = "Open Source Biometric Recognition";
-    homepage = "http://openbiometrics.org/";
-    license = lib.licenses.asl20;
-    maintainers = with lib.maintainers; [flosse];
-    platforms = with lib.platforms; linux;
-    broken = true;
-  };
-}
diff --git a/pkgs/development/tools/vogl/default.nix b/pkgs/development/tools/vogl/default.nix
deleted file mode 100644
index 2e9e8936ddb15..0000000000000
--- a/pkgs/development/tools/vogl/default.nix
+++ /dev/null
@@ -1,57 +0,0 @@
-{ mkDerivation, lib, fetchFromGitHub
-, cmake, git, pkg-config, wget, zip
-, qtbase, qtx11extras
-, libdwarf, libjpeg_turbo, libunwind, xz, tinyxml, libX11
-, SDL2, SDL2_gfx, SDL2_image, SDL2_ttf
-, freeglut, libGLU
-, fetchpatch
-}:
-
-mkDerivation {
-  pname = "vogl";
-  version = "2016-05-13";
-
-  src = fetchFromGitHub {
-    owner  = "deepfire";
-    repo   = "vogl";
-    rev    = "cbc5f1853e294b363f16c4e00b3e0c49dbf74559";
-    sha256 = "17gwd73x3lnqv6ccqs48pzqwbzjhbn41c0x0l5zzirhiirb3yh0n";
-  };
-
-  patches = [
-    (fetchpatch {
-      name = "fix-qt59.patch";
-      url = "https://github.com/ValveSoftware/vogl/commit/be3d85f.patch";
-      sha256 = "1yh4jd35mds337waqxdw3w22w7ghn05b5jm7fb4iihl39mhq6qyv";
-    })
-  ];
-
-  nativeBuildInputs = [ cmake pkg-config ];
-
-  buildInputs = [
-    git wget zip
-    qtbase qtx11extras
-    libdwarf libjpeg_turbo libunwind xz tinyxml libX11
-    SDL2 SDL2_gfx SDL2_image SDL2_ttf
-    freeglut libGLU
-  ];
-
-  dontUseCmakeBuildDir = true;
-  preConfigure = ''
-    cmakeDir=$PWD
-    mkdir -p vogl/vogl_build/release64 && cd $_
-  '';
-  cmakeFlags = [
-    "-DCMAKE_VERBOSE=On"
-    "-DBUILD_X64=On"
-  ];
-
-  meta = with lib; {
-    description = "OpenGL capture / playback debugger";
-    homepage = "https://github.com/ValveSoftware/vogl";
-    license = licenses.mit;
-    maintainers = [ maintainers.deepfire ];
-    platforms = [ "x86_64-linux" "i686-linux" ];
-    broken = true;
-  };
-}
diff --git a/pkgs/games/ue4/default.nix b/pkgs/games/ue4/default.nix
index 95f0d64f19759..0260e4f2e20d4 100644
--- a/pkgs/games/ue4/default.nix
+++ b/pkgs/games/ue4/default.nix
@@ -76,7 +76,8 @@ stdenv.mkDerivation rec {
     homepage = "https://www.unrealengine.com/what-is-unreal-engine-4";
     license = lib.licenses.unfree;
     platforms = lib.platforms.linux;
-    maintainers = [ lib.maintainers.puffnfresh ];
+    maintainers = [ ];
+    # See issue https://github.com/NixOS/nixpkgs/issues/17162
     broken = true;
   };
 }
diff --git a/pkgs/misc/cups/drivers/samsung/4.00.39/default.nix b/pkgs/misc/cups/drivers/samsung/4.00.39/default.nix
deleted file mode 100644
index 92f5fdc409c46..0000000000000
--- a/pkgs/misc/cups/drivers/samsung/4.00.39/default.nix
+++ /dev/null
@@ -1,44 +0,0 @@
-# Tested on linux-x86_64.  Might work on linux-i386.  Probably won't work on anything else.
-
-# To use this driver in NixOS, add it to printing.drivers in configuration.nix.
-# configuration.nix might look like this when you're done:
-# { pkgs, ... }: {
-#   printing = {
-#     enable = true;
-#     drivers = [ pkgs.samsungUnifiedLinuxDriver ];
-#   };
-#   (more stuff)
-# }
-# (This advice was tested on 2010 August 2.)
-
-{ lib, stdenv, fetchurl, cups, gcc, ghostscript, glibc, patchelf }:
-
-# Do not bump lightly! Visit <http://www.bchemnet.com/suldr/supported.html>
-# to see what will break when upgrading. Consider a new versioned attribute.
-let
-  cups' = lib.getLib cups;
-in stdenv.mkDerivation rec {
-  pname = "samsung-UnifiedLinuxDriver";
-  version = "4.00.39";
-
-  src = fetchurl {
-    url = "http://www.bchemnet.com/suldr/driver/UnifiedLinuxDriver-${version}.tar.gz";
-    sha256 = "144b4xggbzjfq7ga5nza7nra2cf6qn63z5ls7ba1jybkx1vm369k";
-  };
-
-  nativeBuildInputs = [ patchelf ];
-  buildInputs = [ cups' gcc ghostscript glibc ];
-
-  inherit gcc ghostscript glibc;
-  cups = cups';
-
-  builder = ./builder.sh;
-
-  meta = with lib; {
-    description = "Samsung's Linux printing drivers; includes binaries without source code";
-    homepage = "http://www.samsung.com/";
-    license = licenses.unfree;
-    platforms = platforms.linux;
-    broken = true;   # libscmssc.so and libmfp.so can't find their library dependencies at run-time
-  };
-}
diff --git a/pkgs/tools/security/neopg/default.nix b/pkgs/tools/security/neopg/default.nix
deleted file mode 100644
index e39be14475ef5..0000000000000
--- a/pkgs/tools/security/neopg/default.nix
+++ /dev/null
@@ -1,49 +0,0 @@
-{ lib, stdenv
-, fetchFromGitHub
-, cmake
-, sqlite
-, botan2
-, boost
-, curl
-, gettext
-, pkg-config
-, libusb1
-, gnutls }:
-
-stdenv.mkDerivation rec {
-  pname = "neopg";
-  version = "0.0.6";
-
-  src = fetchFromGitHub {
-    owner = "das-labor";
-    repo = "neopg";
-    rev = "v${version}";
-    sha256 = "15xp5w046ix59cfrhh8ka4camr0d8qqw643g184sqrcqwpk7nbrx";
-    fetchSubmodules = true;
-  };
-
-  nativeBuildInputs = [  cmake gettext pkg-config ];
-
-  buildInputs = [ sqlite botan2 boost curl libusb1 gnutls ];
-
-  doCheck = true;
-  checkTarget = "test";
-  dontUseCmakeBuildDir = true;
-
-  preCheck = ''
-    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH''${LD_LIBRARY_PATH:+:}$(pwd)/3rdparty/googletest/googletest:$(pwd)/neopg
-  '';
-
-  meta = with lib; {
-    homepage = "https://neopg.io/";
-    description = "Modern replacement for GnuPG 2";
-    license = licenses.gpl3;
-    longDescription = ''
-      NeoPG starts as an opiniated fork of GnuPG 2 to clean up the code and make it easier to develop.
-      It is written in C++11.
-    '';
-    maintainers = with maintainers; [ erictapen ];
-    platforms = platforms.linux;
-    broken = true; # fails to build with recent versions of botan. https://github.com/das-labor/neopg/issues/98
-  };
-}
diff --git a/pkgs/tools/typesetting/pdftk/legacy.nix b/pkgs/tools/typesetting/pdftk/legacy.nix
deleted file mode 100644
index 1899788703762..0000000000000
--- a/pkgs/tools/typesetting/pdftk/legacy.nix
+++ /dev/null
@@ -1,44 +0,0 @@
-{ fetchurl, lib, stdenv, gcj, unzip }:
-
-stdenv.mkDerivation rec {
-  pname = "pdftk";
-  version = "2.02";
-
-  src = fetchurl {
-    url = "https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/pdftk-${version}-src.zip";
-    sha256 = "1hdq6zm2dx2f9h7bjrp6a1hfa1ywgkwydp14i2sszjiszljnm3qi";
-  };
-
-  nativeBuildInputs = [ gcj unzip ];
-
-  hardeningDisable = [ "fortify" "format" ];
-
-  preBuild = ''
-    cd pdftk
-    sed -e 's@/usr/bin/@@g' -i Makefile.*
-    NIX_ENFORCE_PURITY= \
-      make \
-      LIBGCJ="${gcj.cc}/share/java/libgcj-${gcj.cc.version}.jar" \
-      GCJ=gcj GCJH=gcjh GJAR=gjar \
-      -iC ../java all
-  '';
-
-  # Makefile.Debian has almost fitting defaults
-  makeFlags = [ "-f" "Makefile.Debian" "VERSUFF=" ];
-
-  installPhase = ''
-    mkdir -p $out/bin $out/share/man/man1
-    cp pdftk $out/bin
-    cp ../pdftk.1 $out/share/man/man1
-  '';
-
-
-  meta = {
-    description = "Simple tool for doing everyday things with PDF documents";
-    homepage = "https://www.pdflabs.com/tools/pdftk-server/";
-    license = lib.licenses.gpl2;
-    maintainers = with lib.maintainers; [ raskin ];
-    platforms = with lib.platforms; linux;
-    broken = true; # Broken on Hydra since 2020-08-24
-  };
-}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index d613e6057c9f2..377656e0d2f84 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8535,8 +8535,6 @@ with pkgs;
 
   ndisc6 = callPackage ../tools/networking/ndisc6 { };
 
-  neopg = callPackage ../tools/security/neopg { };
-
   netboot = callPackage ../tools/networking/netboot {};
 
   netbootxyz-efi = callPackage ../tools/misc/netbootxyz-efi { };
@@ -18331,8 +18329,6 @@ with pkgs;
 
   libdaemon = callPackage ../development/libraries/libdaemon { };
 
-  libdap = callPackage ../development/libraries/libdap { };
-
   libdatrie = callPackage ../development/libraries/libdatrie { };
 
   libdazzle = callPackage ../development/libraries/libdazzle { };
@@ -25725,7 +25721,6 @@ with pkgs;
 
   deadbeefPlugins = {
     headerbar-gtk3 = callPackage ../applications/audio/deadbeef/plugins/headerbar-gtk3.nix { };
-    infobar = callPackage ../applications/audio/deadbeef/plugins/infobar.nix { };
     lyricbar = callPackage ../applications/audio/deadbeef/plugins/lyricbar.nix { };
     mpris2 = callPackage ../applications/audio/deadbeef/plugins/mpris2.nix { };
     statusnotifier = callPackage ../applications/audio/deadbeef/plugins/statusnotifier.nix { };
@@ -26747,8 +26742,6 @@ with pkgs;
 
   moe =  callPackage ../applications/editors/moe { };
 
-  multibootusb = libsForQt514.callPackage ../applications/misc/multibootusb { qt5 = qt514; };
-
   praat = callPackage ../applications/audio/praat { };
 
   quvi = callPackage ../applications/video/quvi/tool.nix {
@@ -28857,7 +28850,6 @@ with pkgs;
   pdftk = callPackage ../tools/typesetting/pdftk {
     jre = jre8; # TODO: remove override https://github.com/NixOS/nixpkgs/pull/89731
   };
-  pdftk-legacy = lowPrio (callPackage ../tools/typesetting/pdftk/legacy.nix { });
   pdfgrep  = callPackage ../tools/typesetting/pdfgrep { };
 
   pdfpc = callPackage ../applications/misc/pdfpc {
@@ -29267,8 +29259,6 @@ with pkgs;
 
   raiseorlaunch = callPackage ../applications/misc/raiseorlaunch {};
 
-  rapcad = libsForQt514.callPackage ../applications/graphics/rapcad { boost = boost159; };
-
   rapid-photo-downloader = libsForQt5.callPackage ../applications/graphics/rapid-photo-downloader { };
 
   rapidsvn = callPackage ../applications/version-management/rapidsvn { };
@@ -30374,8 +30364,6 @@ with pkgs;
 
   vocal = callPackage ../applications/audio/vocal { };
 
-  vogl = libsForQt5.callPackage ../development/tools/vogl { };
-
   volnoti = callPackage ../applications/misc/volnoti { };
 
   vorbis-tools = callPackage ../applications/audio/vorbis-tools {
@@ -34512,7 +34500,6 @@ with pkgs;
 
   samsung-unified-linux-driver_1_00_36 = callPackage ../misc/cups/drivers/samsung/1.00.36 { };
   samsung-unified-linux-driver_1_00_37 = callPackage ../misc/cups/drivers/samsung/1.00.37.nix { };
-  samsung-unified-linux-driver_4_00_39 = callPackage ../misc/cups/drivers/samsung/4.00.39 { };
   samsung-unified-linux-driver_4_01_17 = callPackage ../misc/cups/drivers/samsung/4.01.17.nix { };
   samsung-unified-linux-driver = res.samsung-unified-linux-driver_4_01_17;
 
diff --git a/pkgs/top-level/qt5-packages.nix b/pkgs/top-level/qt5-packages.nix
index 7629790d50d44..8551c5f9bff24 100644
--- a/pkgs/top-level/qt5-packages.nix
+++ b/pkgs/top-level/qt5-packages.nix
@@ -154,8 +154,6 @@ in (kdeFrameworks // plasmaMobileGear // plasma5 // plasma5.thirdParty // kdeGea
 
   mlt = callPackage ../development/libraries/mlt/qt-5.nix { };
 
-  openbr = callPackage ../development/libraries/openbr { };
-
   phonon = callPackage ../development/libraries/phonon { };
 
   phonon-backend-gstreamer = callPackage ../development/libraries/phonon/backends/gstreamer.nix { };