pegboard is a social bookmarking service that lets you save, search, share and tag your bookmarks with people all over the world!
These guys have designed cheap, easy-to-reproduce plans for farming and manufacturing (brick, so far) equipment.
An open-sourced AppEngine-based application for scheduling courses.
Developer (Mono for OS X)
A public radio show with Christopher Lydon
Open Source collaboration for calendars , mail, and contacts
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