DF11BatchItUpDemo is a project mainly written in ..., it's free.
This is the source code from our demo at Dreamforce '11 on Batch Apex
Below is the source code for the Dreamforce '11 breakout session, "Big Job, Batch it Up". This repo includes the mobile "Emo Entry" page, the batch process to calculate the emotions, and the EmoViz page to visualize the results.