ModMeta Relay is an unofficial implementation of the ModMeta API for interfacing Vortex (or any other ModMeta client) with any non-Nexus mod source. To clarify, this project is not affiliated in any way with Nexus Mods or anyone else, and is an open-source community resource.
So what's different about the Relay server? ModMeta Relay intends to be an extensible and configurable server that can provide a ModMeta-compatible API to any other non-Nexus metadata source.
ModMeta Relay doesn't provide any metadata itself! The actual metadata comes from plugins that can then load metadata from a file, database, API or cache and the Relay server will return the results.
Full documentation for getting started with ModMeta Relay as well as how to build plugins are available agc93.github.io/modmeta-relay/.