Rangy
A cross-browser JavaScript range and selection library.
The current version is version 1.3.0.
The latest source code and releases are on GitHub.
Bower
There is now an official Rangy package for Bower with Rangy 1.2 and 1.3 versions, called rangy.
AMD
Rangy 1.3 has AMD support.
NPM
There is an official Rangy module on NPM called rangy.
Documentation
Documentation is in the GitHub wiki.