jahnabi is a windows based tool to write in assamese language using unicode. No installation or prior experience required. Very easy to use. You are set within 5 minutes of trying your hand with the tool. Use Control Q to switch between English and Assamese language. The help file link is provided. You can minimize the software to the windows taskbar while working
The software requires dotnet framework 2.0 or 4.0 which is freely downloadable from microsoft's website. The key mapping is phonetic like 'k' for 'ko' 'kh' for 'kho' etc.