Indeed, the PICO-8 BBS [1] is a smorgasbord of open-source games of various kinds and quality.
A lot of people (including me) practice extreme open-source for PICO-8 carts by licensing them as Creative Commons, which is easy to do - you just click a checkbox on submission.
This in turn leads to the best games being tweaked and remixed quite a lot - for example Celeste [2] (in my opinion, the best game on the platform) has at least one variant with a lot of new mechanics and gameplay [3].
A lot of people (including me) practice extreme open-source for PICO-8 carts by licensing them as Creative Commons, which is easy to do - you just click a checkbox on submission.
This in turn leads to the best games being tweaked and remixed quite a lot - for example Celeste [2] (in my opinion, the best game on the platform) has at least one variant with a lot of new mechanics and gameplay [3].
[1] PICO-8 BBS: http://www.lexaloffle.com/bbs/?cat=7
[2] Celeste: http://www.lexaloffle.com/bbs/?tid=2145
[3] Perisher: http://www.lexaloffle.com/bbs/?tid=27694