Recently I wrote an app called RemoteBase with Meteor + Mantra. Soon after launching it got ~100 concurrent visitors and I rewrote it without Meteor.
I open sourced the old code. The repo is https://github.com/remotebase/remotebase-mantra.
It is using Meteor + Mantra. Hopefully it will serve as a helpful example of a production Mantra app.
How did you rewrote the app (new framework?) and what is the reason for that (especially when you open source your code for meteor)?
I just copied & pasted my React components into a new codebase and wrote REST API to serve data. The reason for rewriting can be found here: https://forums.meteor.com/t/server-is-dying-due-to-traffic-what-can-i-do
When using REST API - you still use Meteor as the backend but with a REST frontend instead of the DDP client?
I ended up using Express but I guess the same could be done with Meteor.