At BitNami we make it easy for people to install open source software by providing free installers, virtual machines and Amazon Machine images. We have a lot of popular apps, including Rails-based ones like Redmine. Every two weeks, we create a contest in which our users decide which application we should package.
Discourse is one of the top voted apps right now and the contest finishes on Monday. You can vote for Discourse here:
[UPDATE: Discourse won the contest and is available at Discourse Cloud Hosting, Discourse Installer, Docker Container and VM]
If Discourse wins, we will be providing all-in-one native installers for Windows, OS X and Linux that will bundle Apache, a Ruby runtime with Rails, a database, etc. so you can run Discourse locally for development (or just to try it out). We will also provide Ubuntu-based virtual machines that you can download and run in VMWare and machine images for Amazon Web Services and Azure.