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Y Combinator funded AppJet is an online programming tool for building simple web apps. Founded by former MIT students, AppJet intends to simplify the process of writing web applications. The applications are programmed on a web based text editor in the simple but powerful JavaScript programming language. JavaScript is used on both the server and client side. They've included several bundles of code libraries for databases and more importantly interfacing with the Facebook API. In order to efficiently host users' applications, AppJet has developed their own application virtualization system. The system allocates processor time to active applications and cuts off greedy ones after running an alloted number of compiled lines of code to prevent abuse. AppJet as a dev platform seems no longer to be active. There are some legacy downloads available, however.

Clustrix provides the leading scale-out relational database engineered for the cloud or data center. ClustrixDB is a drop-in replacement for MySQL and an ideal solution for high-transaction, high-value workloads typically found in businesses such as ad tech, e-commerce, gaming, and large web and mobile businesses. Our customers use ClustrixDB for critical business applications that support massive transactional volume. ClustrixDB delivers more than twenty-five trillion transactions per month for customers including AOL, Nielsen, Match, MakeMyTrip, Photobox, Rakuten, and Symantec. Headquartered in San Francisco, Clustrix is funded by HighBar Partners, Sequoia Capital, U.S. Venture Partners, ATA Ventures, and Y Combinator. ClustrixDB is available in software that runs on commodity hardware and on any cloud. Visit www.clustrix.com to learn more. Follow @Clustrix on Twitter and "like"​ us on Facebook! #BetterSQL