Belarusian keyboard layouts combined with other languages used by belarusians for Windows and MacOS. Additional letters can by typed by holding AltGr button (Option on mac or left Ctrl+Alt on Windows). One can type in 2 languages without switching keyboard layout: Alt+S=Š.
Belcombo layouts website in russian.
Based on russian, all the belarusian letters added. Download
Based on the US English, belarusian and polish letters adeed. Enables a user to type in 3 languages without switching the layout. It is supposed to replace the standard english layout in your system, so for Windows it installs with en-US locale. Download
Based on Belarusian, all the russian letters added. Download
Use Ukelele on macOS and Microsoft Keyboard Layout Creator on Windows to edit the source files.