Dread is an onion based free speech platform and forum, where you can post, comment and share among tonnes of different communities. It was developed with both privacy and usability in mind, choosing to stick to a common user interface to match the likes of Reddit, but without the added security issues that are involved with the use of JavaScript.
http://dreadytofatroptsdj6io7l3xptbet6onoyno2yv7jicoxknyazubrad.onion (onion v3)
http://dreadditevelidot.onion/ (onion v2)