mpr provides missile command for linux. I will undoubtedly need this link in the near future as there was one of these in my college dormitory basement. It might be fun to organize a tournament next time some of us get together for old time's sake. Perhaps I should run a google for a linux based free asteroids ..... surely this must have happened already. Yep.
google {GPL asteroids source code} provides over ten pages of links to peruse, this one looked interesting initially: http://www.math.grin.edu/~rebelsky/Courses/CS397/2000S/maelstrom.txt
tnt provides some links potentially of future interest regarding potential linux multimedia tools.
logic provides a list of business tool links and also a project planner. Be interesting to see what he thinks of it after a few projects or months.