Is there anything similar that's open source and self hosted and can be hooked into any agent via MCP?

I know that Vercel or something similar is quite close to that, but it's not that well integrated into MCP/Skills.

I have been building https://github.com/openrundev/openrun. OpenRun allows you to build web apps, adding OIDC/SAML with RBAC to control who can access the apps. Supports MCP for app management. Also supports service bindings, which enables providing each app an isolated database account.