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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.

Founded in 2005, TextPayMe is an SMS payment service that lets you send money to other people using cell phone text messaging. TextPayMe lets you send money to anyone else in the US with an SMS-capable cell phone, and while phone carriers may charge for the actual text message sent/received, sending and receiving money is free while TextPayMe remains in Beta. In July 2006, the TextPayMe team started working for Amazon and, as of 2011, the site redirects to an Amazon's mobile payment website. There was no press release related to this event but it's assumed the company was acquired. Sending and receiving payments through TextPayMe is easy: simply write a text message to [email protected] with "pay amount phonenumber" in the body (i.e. to send $5 to 123-456-7890, text "pay 5 1234567890"). The service is secure as well, as each payment needs to be confirmed by a user-created PIN. To fund your transactions, TextPayMe lets you add money directly from your bank account and now also lets you link your credit card as well. Currently, the maximum amount that can be sent or received per month is $500.