If you're interested in helping us develop Discourse, please start with our [**Discourse Vagrant Developer Guide**](https://github.com/discourse/discourse/blob/master/docs/VAGRANT.md), which includes instructions to get up and running in a development environment using a virtual machine. It's the easiest way to hack on Discourse!
If you're familiar with how Rails works and are comfortable setting up your own environment, use our [**Discourse Advanced Developer Guide**](https://github.com/discourse/discourse/blob/master/docs/DEVELOPER-ADVANCED.md).
Before you get started, ensure you have the following minimum versions: [Ruby 1.9.3+](http://www.ruby-lang.org/en/downloads/), [PostgreSQL 9.1+](http://www.postgresql.org/download/), [Redis 2.6+](http://redis.io/download). And if you're having trouble, please see our [**TROUBLESHOOTING GUIDE**](https://github.com/discourse/discourse/blob/master/docs/TROUBLESHOOTING.md) first!
Discourse is a **Civilized Discourse Construction Kit**, an 100% open-source discussion platform that is free for everyone to use and contribute to -- forever. Our key mission goals:
- A **flattened, endlessly scrolling discussion**, avoiding the awkardness of traditionally threaded and paginated discussion, while allowing replies to be expanded in place for additional context.
- A **user trust system** that grants users additional rights to assist in moderating the forum as they participate in good faith over time. The goal is for the forum to be nearly self-moderating in the absence of any formal moderators, although excellent moderators accelerate the process greatly.
The Discourse team wishes to **foster an active community of contributors**, all of whom commit to delivering this continued vision, ensuring that free, unfettered online discussion can grow and thrive in an Internet age dominated by micro-blogging, and diminishing attention spans. Online discussion belongs to all of us, not just huge corporate websites.
2. Read and sign the [**Electronic Discourse Forums Contribution License Agreement**](http://discourse.org/cla), to confirm you've read and acknowledged the legal aspects of your contributions, and
3. Dig into [**CONTRIBUTING.MD**](https://github.com/discourse/discourse/blob/master/docs/CONTRIBUTING.md), which houses all of the necessary info to:
The original Discourse code contributors can be found in [**AUTHORS.MD**](https://github.com/discourse/discourse/blob/master/docs/AUTHORS.md). For a complete list of the many individuals that contributed to the design and implementation of Discourse, please refer to [the official Discourse website](http://www.discourse.org).
