SaidIt.net

Free as in price, speech, and freedom, with an awesome and mature community!

Saidit is based on the open source Reddit code, but is moderated with the "pyramid of discourse", which discourages lowering the level of discussion. It also lacks a downvote feature. That means that the only ways to respond to content you disagree with are to ignore it, or to make a rebuttal that is at least as civil and coherent as the original content.
The owners and the community seem to value free speech, and the only prohibited content is that which presents legal risks, like pornography.

It provides free speech and doesn't censor people, but the design sucks badly

Really good alternative to Reddit

Fantastic, without 'downvote' option, which creates less frustration and more quality.

Lightweight forum hosting site, albeit one with a really ugly design. It's also centralized, so if it's ever bought or seized, there's nothing they can do

While I do genuinely value critiques of corporate media, this platform suffers from the same shit Voat does. Namely, it's taken over by rightwingers. I appreciate that it's open sourced, but that doesn't make up for the fact that their version of /r/science is full of anti-vaxxers and climate change deniers calling themselves "truth-seekers"

If you find an alternative to corporate media and you just end up with more corporate-pushed worldviews (i.e. climate denialism), you're doing something wrong. Same goes for their politics, but I don't wanna get into that mess