Lemmy

Lemmy is a link aggregation and discussion forum platform similar to Reddit-style communities, built to run as independent servers that can federate with each other. It uses ActivityPub to share posts, comments, and communities across instances while keeping local control over moderation and policies.

Key Features

• ActivityPub federation between instances (Fediverse-compatible)
• Community-based posts with voting and threaded comments
• Moderation tooling for admins and community moderators, including public moderation logs
• User mentions and community tagging, plus notifications (including email notifications)
• RSS/Atom feeds for key views such as subscribed content and community feeds
• Themes and a mobile-friendly web interface
• Media support including avatars and integrated image uploads

Use Cases

• Host a public or private Reddit-like community with fine-grained moderation
• Build a federated discussion network that can interact with other Fediverse servers
• Create topic-focused forums for organizations, projects, or interest groups

Lemmy is well-suited for communities that want a modern voting-based forum with federation and strong local autonomy. It provides a familiar user experience while enabling decentralized hosting and cross-instance discussion.