A cross-browser JavaScript range and selection library.
The current development version is version 1.3. It's officially still in alpha but the core and most modules are pretty stable. The new TextRange and Highlighter modules are still in active development and as such are more unstable.
The latest source code and releases of version 1.3 are on GitHub. Downloads of stable 1.2 builds are on Google Code.
There is now an official Rangy 1.3 package for Bower, called rangy.
Rangy now has AMD support.
There is a Rangy module on NPM called rangy. It doesn't do anything useful in Node but you can do Browserify stuff with it.