It's not just about deals at CrowdSavings, it's also about writing (and sharing) great code. That being said, we have opened up our platform to enable third party application development on top of the CrowdSavings platform (documentation available here).
We're also huge fans of open source software and make strides to release code when we can. Our major contribution thus far is a jQuery plug-in built to capture signatures from a tablet device (specifically an iPad). We call it DrawBox and we use it for electronic contracts but we're sure you can come up with some other fun uses. DrawBox can be seen in action here and additional code can be found on our GitHub page.