The Einstein Toolkit software is an open-source, community-driven code for relativistic astrophysics and gravitational physics. CCRG members contribute to the development of the toolkit.
LazEv is the in-house numerical relativity code for binary black hole simulations. It's based on the "moving puncture approach" which produced a breakthrough in numerical relativity in 2005.
A number of software packages are useful for working with LIGO data. The RIT's Ligo Scientific collaboration uses public LIGO codes for its data analysis tasks.