Do you like computer games. Then you will like the three links below from the Wikipedia
1. Commercial games released as freeware : These are the commercial games released as freeware
2. Freeware games : These are games that were originally released as freeware
3. Open source games : Open source games are computer games assembled out of, and are themselves, open-source software and open content; public domain games are also listed.
Open each game page in wikipedia and check the right side box or for the external links at the bottom, which will direct you to the download page