A Cocoa framework for making OS X apps update themselves automatically.
Sparkle is an open source software framework for OS X designed to simplify updating software for the end user of a program. Sparkle's primary means of distributing updates is through "appcasting," a term coined for the practice of using an RSS enclosure to distribute updates and release notes.
At the end of 2013, development of Sparkle was ended by the original author, then later picked up by the newly formed Sparkle Project open source group on GitHub in June 2014 as the official continuation of the project. wikipedia
Sparkle was created by Andy Matuschak and is currently developed and maintained by the Sparkle Project.
Current version:
The latest official release is 1.7.1, delivered on 1 July 2014.
License
Sparkle is available under the MIT license.