TypeScript: a language for application-scale JavaScript development
Say what you want about whether this is a good idea or not, it is clear at least part of MS is really serious about open source.* TypeScript is under the Apache 2.0 license [1]* Source is available via git on Codeplex [2]* Installation is as easy as npm install -g typescript [3]Extra bonus coolness: They've provided an online playground like jsfiddle! [4].[1]http://typescript.codeplex.com/license[2]http://typescript.codeplex.com/SourceControl/changeset/view/...[3]http://www.typescriptlang.org/#Download[4]http://www.typescriptlang.org/Playground/