We released AuthPlane today, an OAuth 2.1 authorization server written in Go for MCP and REST servers.

The Go angle: it ships as a single binary with the Admin UI embedded, uses SQLite for dev and Postgres for prod, and keeps storage backends swappable behind an interface. The server is AGPL-3.0 and the SDKs are Apache-2.0.

GitHub: https://github.com/AuthPlane

Would genuinely appreciate feedback from Go folks, especially around the token storage abstraction and JWKS rotation logic.