http://classicdosgames.com/all.html
the agenda which explain the colours could use some improvements I think.
(Hyperlinks point to each game's download page in "By Publisher", "By Genre", and "By Year". Blue games are shareware, green games are freeware, and red games have officially abandoned their copyright into the public domain (abandonware).)
Maybe a small table, list, or some background colours on the words: shareware(blue),freeeware,public domain(red)