Spoken

Joyent To Offer Open Source Version of Slingshot: When Slingshot ships, Joyent will use a dual license model similar to Trolltech, MySQL, and Sleepycat. Open Source and/or Free Slingshot will be open-sourced under the GPL and available to anyone with a publicly available service that is free (advertising is “ok”) running on the Rails platform. An example of this type of application is Twitter. You will be able to download the source-code of Slingshot, dig your fingers in, and work with it in any way you see fit. We are planning a number of initiatives in order to build a vibrant community around Slingshot and are currently working to get a number of open source Rails applications working on Slingshot. We have Radiant working, and we will release this as part of the SDK when we ship Slingshot to the world. [Cool.]
Source: Joyeur