Shoutrrr

Shoutrrr is a self-hosted social media scheduling tool that lets you draft posts once and publish them across X, LinkedIn, Bluesky, Discord, Facebook, Instagram, and Threads simultaneously. It's designed for individuals and teams who want to own their data, audience tokens, and analytics on their own infrastructure, with no per-seat pricing or vendor lock-in.

The app includes a unified composer with per-network character counts, auto-threading, a posting queue with recurring schedules, team workspaces with roles, and engagement analytics. You can self-host it free using Docker or use the managed Cloud option. The project describes itself as an open-source alternative to Buffer, Typefully, and Hootsuite.