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Hello, Chair Inc. was founded in 2006 by Luke Iannini, Mike Jacobs and Kevin Corcoran to explore opportunities in applied machine learning and internet advertising. After receiving funding from Y-Combinator in 2007, we produced Adpinion, one of the first advertising networks to utilize user feedback to drive personalized targeting.\n\nOur core technology — the recommendation engine called SparseReduce — has since proved infinitely adaptable in such diverse problem domains as Amazon product recommendation, eBay auction discovery, image and language comprehension, and Twitter stream exploration.\n\nThe latest application of SparseReduce is Appsaurus, an app discovery platform which was released on the eve of 2010 to overwhelming critical acclaim.\n\nWe're backed by some pretty incredible investors: Harrison Metal, Mitch Kapor, Chris Sacca, Y-Combinator and David Parker to name a few. We're also proud to have Alexis Ohanian as an advisor.

Auctomatic, a Y Combinator company, offers an auction and marketplace management system for all of those individual sellers on such sites as Ebay, Amazon, Overstock and others. The application lets you list your items as well as manage your sales, but it also helps you understand how to best optimize your selling and maximize profits.\n\nThe company also received an investment from Paul Buchheit, the lead developer of Gmail.

Bountii is a price search startup that has built a search engine capable of finding shoppers lower and more accurate prices than any existing price comparison service. Currently supplying consumers with pricing information on electronics and appliances, Bountii aims to expand its service to make buying any product online at the best price an effortless experience.\n\nBountii was founded in the Summer of 2007 by Samir Meghani and John Puskarich. Initial investment was provided by Y Combinator, a venture firm that specializes in funding early stage startups.

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.\r\n\r\nOur 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.\r\n\r\nHeadquartered 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.\r\n\r\nVisit www.clustrix.com to learn more.\r\n\r\nFollow @Clustrix on Twitter and \

Data Marketplace helps people find, buy and sell data online. It helps users seeking a specific data to creating a request for free, explain their needs, add an optional deadline and budget, and in turn allows aggregators respond with relevant data for purchase. All of the data on Data Marketplace is available for immediate purchase and download. They provide data in standard formats (e.g. Excel, CSV, XML, JSON) .\n\nData Marketplace is funded by Y Combinator.

WakeMate makes personalized alarm clocks that sync with both a user's body and their cell phone, enabling the iPhone alarm system to sound at the end of a REM cycle.\n\nThe application/ wristband system also provides a full sleep analysis on their Analytics Platform.\n\nThe WakeMate uses a science called actigraphy to analyze your sleep. Actigraphy uses an actigraph (the WakeMate unit) placed on a subject’s wrist to monitor the motion. The motion data is then analyzed to determine sleep patterns and circadian rhythms of the subject.\n\nWakeMate was funded by the startup incubator Y Combinator.

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.\n\nAppJet as a dev platform seems no longer to be active. There are some legacy downloads available, however.

Make something people want.