BirdGrinder was one of the outcomes of extracting Perennial out of Marvin. The general idea behind BirdGrinder was to create an extensive, featureful framework for building twitter applications (e.g. larger scale, better designed for building bots – Primarily for a friends twitter-based werewolf game).

The layer of code on top of Perennial is also very similar to Marvin but it offers several interesting features that at the time were (as far as I know) yet to implemented together:

• Oauth and Basic Authentication support (I contributed back support for em-http-request in the oauth rubygem for this)
• Support for the streaming api (a perfect fit for an evented twitter client) alongside the normal twitter api
• Designed for building applications (over simple twitter events)
• Uses em-http-request for all http requests.

If you’re still interested, click the website link above to view the introduction docs.