I there's such a list, I would be really grateful if someone could share it. If not, let's create one here.
Thanks to Calinou!! :)
I've been researching open-source alternatives to PICO-8, since I really like the idea of limiting oneself in order to boost one's creativity. Besides, it perfectly fits into the theme of the jam. So here's a list of what I've found so far:
They are all very similar, except for the VectorBoy which is (as the name suggests) for vector graphics, and Zenith80 which is for hardcore programming :)
As far as the functionality, stability and documentation go, it looks like TIC-80 and PX8 are the most mature, and they also have the biggest communities, but I am eager to try less known ones.