Stack Exchange Data Explorer allows you to run arbitrary queries on the Stack Exchange public data dumps.
Stack Exchange Data Explorer is Open Source. If you would like to help us make it more awesome, check out the code.
The Stack Exchange trilogy data dumps are hosted at ClearBits!. You can subscribe via RSS and be notified every time a new dump is available. Have fun remixing and reusing; all we ask is for proper attribution.
We also offer OData endpoints for all the Stack Exchange Sites.