diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000000000..5023d02b623d42
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,12 @@
+[submodule "third_party/nlassert/repo"]
+	path = third_party/nlassert/repo
+	url = https://github.com/nestlabs/nlassert.git
+	branch = master
+[submodule "third_party/nlio/repo"]
+	path = third_party/nlio/repo
+	url = https://github.com/nestlabs/nlio.git
+	branch = master
+[submodule "third_party/nlunit-test/repo"]
+	path = third_party/nlunit-test/repo
+	url = https://github.com/nestlabs/nlunit-test.git
+	branch = master
diff --git a/third_party/nlassert/repo b/third_party/nlassert/repo
new file mode 160000
index 00000000000000..700bd55d6ea6ca
--- /dev/null
+++ b/third_party/nlassert/repo
@@ -0,0 +1 @@
+Subproject commit 700bd55d6ea6ca1bedaa2f86bc17e8c0313139aa
diff --git a/third_party/nlio/repo b/third_party/nlio/repo
new file mode 160000
index 00000000000000..9f9f503b77d7d0
--- /dev/null
+++ b/third_party/nlio/repo
@@ -0,0 +1 @@
+Subproject commit 9f9f503b77d7d061ec5a50613b880e9c5bc7ad30
diff --git a/third_party/nlunit-test/repo b/third_party/nlunit-test/repo
new file mode 160000
index 00000000000000..eba9209293e48b
--- /dev/null
+++ b/third_party/nlunit-test/repo
@@ -0,0 +1 @@
+Subproject commit eba9209293e48b677d9c2f733f938041ba2ebdfb