Social network

Forumverse

• Friendica
• Lemmy
• Mbin (github page)
• NodeBB
• PieFed

Microblog

• IceShrimp
• Mastodon (the most notable feature is group support)

Blog

• Wordpress
• Writefreely

Event

• Mobilizon

Media

Book

• Bookwyrm

Culture review

• NeoDB

Live/Streaming

• Owncast

Picture

• PixelFed

Short video

• Loop

Video

• Peertube