Looking at backbonejs.org you’d be forgiven for thinking the project has stagnated somewhat. It’s currently at version 0.9.2, released back in March, 2012. So what’s going on? It turns out a huge amount of work! The developers have committed a slew of changes since then. The latest version and commit history is readily available in the master Backbone.js branch on GitHub. Since March there has been consistent activity on the master branch, including community contributions. The core developers are working hard on releasing 1.0.