RSwift is a low-level library that provides signal/slot and functional reactive programming-like primitives. It can serve as the basis for a user interface toolkit, or any other library that has a model on which clients will listen and to which they will react.
RSwift is a port of React, a Java library that was originally created by Three Rings Design, and which has nothing to do with the JavaScript UI toolkit of the same name.
(RSwift omits the "Futures" and "Promises" components of the original React library; PromiseKit is the defacto Promises implementation in Swift.)
RSwift is released under the MIT License. The most recent version of the library is available at http://github.com/tconkling/rswift
Feel free to open issues on the project's Github home.
Twitter: @timconkling