Is there any open source community forum software like Stack Overflow?

First script - China: WeCenter. PHP and MySQL.

Demo: WeCenter 社交化问答社区程序

Second script: Discourse

Demo: toxu.ru

  • Ruby on Rails — Our back end API is a Rails app. It responds to requests RESTfully in JSON.
  • Ember.js — Our front end is an Ember.js app that communicates with the Rails API.
  • PostgreSQL — Our main data store is in Postgres.
  • Redis — We use Redis as a cache and for transient data.

github: