Megazeux
Gregory Janson, 2001
The best, most flexible game creation system currently available, in my opinion. While it doesn't allow for the best graphics (it's in text mode, but you can edit the ASCII characters), it's the most flexible GCS currently available, and it also allows Soundblaster music and sound effects. There are also plenty of games available (well over 100) and there are also many webpages dedicated to it (five or six dozen!). Check it out. I'm a big fan. :) (Note: Megazeux has been GPL'd ... ie, it is now free, with certain restrictions.)
[Download] Click here to download Megazeux (155k)
Click here to download games made using Megazeux at Digitalmzx.net
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Credit:http://www.dosgames.com/g_gcs.php