7000 DOS games. Almost every single commercial English game, lot of Freeware/Shareware/Foreign games. Every single known shareware was planned, but didn't get in the collection in time (it's about 6000 games need to be tested, so maybe v5 will have it, if it ever will be released). If you ever played commercial English DOS game, 99.9% chance it's there and at least 80% chance it is the best available version (some CD games and rare floppy games are rips still, but tons of games was improved since v3).
Get it at
The Eye.