http://www.sonyindex.com/PS1_Renamer/index.htm
PS1 Renamer is the world's first REAL renaming and auditing utility for Playstation 1 disc images. It is an altered version of GCM_Renamer, a Japanese multi-system image auditing program. I edited the source program and interface to: Focus on PS1 images only; Allow support for compressed images; and Clean up much of the English translation in the GUI and log files.
Download: http://www.sonyindex.com/PS1_Renamer...amer_v1.05.zip
Database file: http://www.sonyindex.com/files/dbase.ps1 (Copy and paste it all into Notepad, then rename it to 'dbase.ps1' and save it in your \PS1_Renamer folder.
Set the database file location.
Set where your PSX ISOs, in RAR/ACE/ZIP/7z archives are located.
Click start, and once it's done it'll have renamed all the compressed archives into something like this "game title [NTSC-U][SCUS-00000]"