Here are some of the projects that we've created from scratch in the DataSift labs and released as open source software.
We run Hackathon's several times a year where engineers have an opportunity to pause for a day and work on projects of their own. Send a Tweet to @DatasiftDev if you'd like to visit us for a day and participate. Pizza lovers only!
Query Builder - graphical way to create DataSift queries. This is the same editor we use on our site and now you can customize it and emebed on your site.
Hubflow - an adaptation of GitFlow and the GitFlow tools git extension for working with GitHub.
Arrow - DataSift visualizer.
Sublime Text CSDL plug-in - validate and compile DataSift CSDL, consume a sample set of interactions, and enjoy correct syntax highlighting. Do it all without leaving Sublime Text!
Sound of Twitter - visualise the sentiment from Twitter with lights and sound.
Dropwizard Extra - extentions to Dropwizard.