This brought me a wave of nostalgia for the old Qbasic "operating system" projects, of which there were many. This site has a lot of reviews and screenshots:
It was a popular style of project. Some even implemented their own programming languages so they could multitask applications written for them by running lines from each app in a round-robin fashion.
Was just about to link this. I was a part of this scene at age thirteen! Was largely how I taught myself fundamentals of programming and how to solve problems. When I'm feeling particularly nostalgic, I'm occasionally tempted to fire up something like DJGPP and finish my childhood dream of making a useful GUI for MS-DOS.
http://qbasicgui.datacomponents.net/
Ans this site has more
http://theguiblog.com/
It was a popular style of project. Some even implemented their own programming languages so they could multitask applications written for them by running lines from each app in a round-robin fashion.