Check out this github repo/wiki of browserify-related game modules and projects: https://github.com/hughsk/game-modules

It's got links to some awesome stuff, including voxel.js (http://voxeljs.com), a set of tools for building minecraft-like games in the browser.

Relatedly, I've been working on a set of js game modules that rely on node.js/browserify called crtrdg: http://crtrdg.github.io – it's not very far along yet, but I'm having fun with it.

Also check out frozen: http://frozenjs.com/docs/ And pixi.js: http://www.pixijs.com/