Squabblr
Squabblr is a hybrid of Twitter and Reddit. It let's you have more in depth conversations than Twitter, but also allows you to post short blurbs on whatever you're thinking.
Saidit.net
An open source, free speech platform that is a continuation and fork of Reddit's open source platform
Tildes
Tildes is an invite-only text focused discussion for more serious conversations.
Lemmy.world
Lemmy.world is the largest instance of Lemmy - a federated network of Reddit-like instances that is resistant to censorship and the pitfalls of centralized administration.
Scored.co
Scored.co is a Reddit alternative with an emphasize on free speech and lax moderation.
Fling Up
FlingUp.com connects users through spontaneous activities, fostering real-world connections in a vibrant community.
Slashdot
Slashdot provides a longstanding and credible platform for tech enthusiasts.
kbin
Kbin.social is a decentralized content aggregator and microblogging platform on the Fediverse network, promoting a free and open internet.
Hive
Hive.blog serves as a forum-style platform akin to Reddit, providing a familiar layout and user experience.
Raddle
Raddle.me provides a hassle-free browsing experience, allowing users to explore diverse discussions without interruptions.
Stack Exchange
Stack Exchange is a focused question and answer community with over 180 expert-moderated communities spanning diverse topics, prioritizing precise answers over discussions.