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In Pictures: 10 most successful open source projec...
Since its genesis as part of a NASA/Rackspace joint effort, dozens of companies have signed on in support of OpenStack. Its widespread support has become something of a double-edged sword, with critics pointing out that, although a lot of companies claim to support it, it's unclear how many are actually contributing to or even using OpenStack. Still, there are more than 6,000 lines of code in OpenStack, so someone is doing something. Despite having to contend with Amazon and CloudStack, OpenStack is firmly entrenched in the cloud market.
In Pictures: 10 most successful open source projects of 2012