[noname120]

There is also a Vita (aka psp2) homebrew/hacking scene that's still alive. There is an SDK [1], a discussion channel on Matrix [2] which is bridged to IRC [3]. There is also a Reddit community [4] (although it's more used by users rather than devs).

[1] https://vitasdk.org/ [2] https://riot.im/app/#/room/#henkaku:matrix.org [3] #henkaku @ irc.freenode.net [4] https://www.reddit.com/r/vitahacks/