Top 3 gaffer open source projects

Atoms Crowd extension for Gaffer

Essential tools and utilities for Gaffer; including GUI, local accumulo cluster, python api

A Visual Effects pipeline to manage jobs, shots and software assignment, with a simple asset manager. Its extensively integrated with CortexVFX and Gaffer. (and it builds booth, with support for Maya, Houdini and Nuke, if you have then installed!)