These are “rooted” stock ROMs for Galaxy S3 Android smartphones. These are nearly 100% identical to official Samsung stock firmwares except they have been rooted plus you can install these stock ROMs easily using CWM or TWRP recovery.
AT&T Galaxy S3 SGH-i747 Stock Rooted ROMs
T-Mobile Galaxy S3 SGH-T999 Stock Rooted ROMs
Sprint Galaxy S3 SPH-L710 Stock Rooted ROMs