Mossy
by Rxflex
Mossy is an experimental Fabric mod that replaces server-based discovery with a peer-to-peer mesh for finding and joining friend-hosted worlds.
What it does
Mossy links Minecraft to MOSS, a mesh networking core implemented in Go and exposed as a CGO native shared library. Players can locate worlds hosted by friends across a distributed mesh and attempt direct connections between peers, without depending on a central server list. Integrated singleplayer worlds can be opened to the network as well.
The author presents the mod as a continuing test of decentralized multiplayer infrastructure. It is labeled experimental, bugs and gaps in compatibility are expected, and releases count as testing builds unless marked otherwise. World discovery, diagnostics and peer management are not yet dependable enough for full play, and networking compatibility is still being refined.
Platform-specific native binaries are packed into the mod jar during the build, taken from the latest official MOSS releases, so no separate native install is needed. Mossy runs on Fabric and supports recent Minecraft releases; the current build targets 1.21.11, and 1.21.9 also has files.
Key features
Friend world discovery
Players find worlds hosted by friends through the MOSS mesh rather than a central server list.
Peer-to-peer transport
An experimental Netty-over-MOSS transport layer carries the multiplayer traffic between peers.
Built-in diagnostics
The mod includes diagnostics and peer bootstrap management for inspecting connections between peers.
In-game interface
A modern in-game UI, built with owo-lib, provides the screens for discovery and peer management.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Testing decentralized multiplayer
Developers and testers can experiment with direct peer-to-peer connections between players on a mesh network.
Publishing a singleplayer world
A player can open an integrated singleplayer world to the mesh so friends can join it.
Who it’s for: Players and developers who want to experiment with decentralized multiplayer architecture, and who accept that the mod is experimental and may break between releases.
Questions
Does Mossy require a server?
Which loader does Mossy use?
Can Mossy be installed on only one side?
In the catalog
Mossy is one of 5,392 Social mods on ModsFinder, and one of 4,084 Social mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
Mesh-powered multiplayer discovery for Minecraft. MossyMod is an experimental multi-version Fabric mod that brings decentralized peer-to-peer networking into Minecraft using the MOSS mesh networking core.
Official listing
- Modrinth page
- modrinth.com/mod/mossymod
- Owner
- Rxflex
- Published
- 2026-05-26
- Updated on Modrinth
- 2026-05-26
- Facts verified
- 2026-10-15