As you all probably know by now, Holla Forums has lots of problems that aren't being fixed. Infinity has been shown to not be able to handle big shitposting events like this years E3 when the site went down, and the American election will no doubt bring the site to its knees once more. Infinity is forked from software that has a statement on its website that says the cruft has accumulated beyond repair: engine.vichan.net
Librechan and 8ch.pl are pointless to me, 8ch.pl faces the same issues that Holla Forums does except its site owner is not terrible. I doubt the longevity of a site that allows cheese pizza like Librechan.
Endchan's administration is kind of cringey from what I have seen, it uses a permissive license, the filesize limit is obviously not going to stay at 350MB if it ever gets enough posters, and most of the popular boards don't really appeal to me. I have not actually seen any proof of Lynxchan being better than Infinity Next or vice versa in a technical sense.
Here are some useful 16chan links from the CMFYS thread if you want to go there. The developer of Infinity Next, Null/Jaw-sh aka Josh runs it:
16chan.nl
16chan.nl
16chan.nl
16chan.nl
Heres the Infinity Next repo: github.com
If you want more information about the AGPL, you can find that here: gnu.org
Before someone mentions it, taking this to /metatech/ is pointless, its a dead board that nobody goes to really. At best you'll end up talking to some moderator.