livid's v2ex at master – GitHub Project Babel 2 is an open source software package for creating and supporting communities. It's written in Python and running on Google App Engine, which is a free and robust cloud hosting infrastructure. (tags: software opensource python gae community v2ex)

Using Bloom Filters – Perl.com (tags: content tutorial code bloomfilters)

Deltacloud | Many Clouds. One API. No Problem. Start an instance on an internal cloud, then with the same code start another on EC2 or Rackspace. Deltacloud protects your apps from cloud API changes and incompatibilities, so you can concentrate on managing cloud instances the way you wan (tags: software opensource api cloud deltacloud)