Stuxnet
https://forum.fail/
/kbin is an open source reddit-like content aggregator and microblogging platform for the fediverse. Create and moderate communities, meet people with similar interests, and develop your passions.
https://pixey.org/
Pixey is an image sharing platform, an ethical alternative to centralized platforms build with ActivityPub that gives you a place in the Fediverse(Federated Universe).
https://gram.social/
Gram is a free open source social media platform where it's all about media! Build on the latest technologies to serve an ad-free platform you are familiar with.
https://peertube.tv/
Videos sharing & live streaming on free open source software PeerTube! No ads, no tracking, no spam.