There is a new development tool for DOS available. If you want to create some stuff for DOS but you only web programming, you might be interested in DOjS, a javascript interpreter for DOS. It can handle sound (digitized and FM syntesis) and graphics (JS canvas, BMP support). For now you can type in a script with your favorite text editor and then run it on a DOS command prompt, using keyboard or mouse. The core DOjs code is MIT license, other components are similar free/open source. More info and download is on the DOjS GitHub.