deepstream solves similar problems as meteor, but is conceptually quite different. It's a standalone server that you install the same way you would install e.g. Nginx or a database. Clients connect to it using small SDKs that come in different languages.

It similarly provides data-sync, pub-sub and request response with no opinion about your frontend framework or technology stack and has an open ecosystem of connectors that make it work with all sorts of databases, caches and message buses.

It's also significantly faster than meteor, making it possible to also use it for multiplayer gaming, realtime trading etc...