If you need to extract data from a system, adapt and transform it to reuse it in another app or a reporting system, while still using Ruby, then look at ActiveWarehouse.

This Ruby ETL tool has just been released in version 1.0.0.rc1, bringing full support for Ruby 1.9.3, Rails 3+ and the "mysql2" ActiveRecord adapter.

Join the google group if you have any question!

Jeremy Lecour wrote a nice and useful article on how to use ruby, rvm, passenger, rails and bundler while you develop.

Some hopefully useful feedback from a project where I've mixed Ubuntu and Windows to do the job. Relies on Resque and JRuby.

A couple of notes from my first heroku/mongohq/sinatra deployment.

I've been working on JRuby/Duby interop to implement VST audio plugins. The first working plugin is a LP/HP filter (with cutoff and resonance). JRuby is used for declarative stuff, while Duby is used for computation intensive stuff. The combination gives an interesting Ruby-tasting audio programming experience.

A solution to monitor file changes and getting growl notifications. With bits of Duby, too.

If you're into music and ruby, here are two screencasts demonstrating Nasir (a live coding system). I believe the code is not yet available but should be on github later on, most likely.

MockSMTP.app is in my opinion a very useful application to test emails locally. It simulates a SMTP and offers a way to browse email accounts graphically. Comes with tips to configure ActionMailer.

Jemini let you use your (J)Ruby skills to create games. Jay McGavren provides a nice two-parts screencast (available on Learnivore.com) if you want to learn more about this nifty project.

Daniel309 made a screencast demonstrating how to use Opaz-PlugDK (experimental JRuby VST plugin framework) to code and tweak VST plugins in real-time.

Also see the blog post here if you need an introduction to this.

In this article I'm sharing the code I use to handle simple time-tracking/invoicing with Google Calendar and rufus-google.

Thanks to John Mettraux for writing rufus-google!

Had some fun analyzing and visualizing my GMail account data.