IsoBuster - For analysing and extracting M2/2353 data track(s). [see above for link]
EAC - For extracting audio tracks
exactly as they should.
Hx D - Hex Editor
QuickSFV - CRC/MD5 checksum generator
BRU - Bulk Renaming Utility
ECM Tools - We have this on the main site.... I will link em later... (If I remember last time the official release site for ECM Tools messed up and the extraction tool the compression tools .. i.e. there was no extraction tool at all)
Pakkiso - We also have this one aswell on the main site
Injector - Eliminates an unnecessary repair step in the old redump.org guide (only affects the last sector of the data track of NoEDC discs with audio tracks)
psxt001z - PSX swiss army knife. Invaluable.
Useful Guides:
http://redump.org/guide/cddumping/
http://redump.org/guide/libcrypt/
http://www.rocknroms.net/cfaq/