ReactOS is an open source alternative to Windows that aims to be binary compatible with both apps and drivers. I didn’t start the project, but I do tinker around with it from time to time and think it’s a great project.
An attempt to fix ReactOS’s PS/2 mouse handling which inconsistently works across platforms. View the branch. You can also download the patch and apply it to whatever ReactOS branch you’d like.
This patch works on many platforms, but will also cause a lockup on others. Maybe I’ll rewrite it sometime