With the release of the firmware, we will be able to see a series of custom ROM based on Android 4.2.2 Jelly Bean for Galaxy S4 very soon.
Custom ROM April 25, 2013
This is the final version of Slim Bean Custom ROM
Custom ROM March 22, 2013
SuperNexus ROM built from Google's AOKP Source lets non-Nexus devices enjoy Nexus-like features.
Custom ROM March 15, 2013
Nexus device owners may be the first to get the newest updates, but many users prefer to spice things up with a custom ROM - here are the top five custom ROMs for the Nexus 4.
Custom ROM February 16, 2013