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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.

Collections is a cross-platform personal content manager built for the age of cloud computing. It gives you access to everything you have stored in cloud services like Dropbox and Google Drive and in web apps like Facebook and Instagram, as well as your local files. As a universal finder for the cloud, Collections lets you bring together all of your most important digital content, helping you to regain control over your online presence. What would Apple's Finder look like if it were invented today, rather than in 1983? Collections is an Internet-age personal content manager, a fundamental reinvention of the file manager that lets you easily access and organize all of the digital content you have that's currently scattered across a dizzying array of cloud storage providers and web apps. It's a file system for the web.