PlayStation 2 Editors/Tools:
Breath of Fire: Dragon Quarter ISO Editor
Download Breath of Fire: Dragon Quarter Editor ver 1.7 (PS2)
Also available at RHDN with a full description: Breath of Fire: Dragon Quarter ISO Editor
Final Fantasy X Boss Editor
Download Final Fantasy X Boss Editor ver 0.9 (PS2)
Also available at RHDN with a full description: Final Fantasy X Boss Editor
Final Fantasy X Monster Editing Tool
Download Final Fantasy X Monster Editing Tool ver 1.1 (PS2)
Also available at RHDN with a full description: Final Fantasy X Monster Editing Tool
Final Fantasy XII Editor
Download Final Fantasy XII Editor ver 1.1 (PS2)
Can read more about the editor here: Final Fantasy XII Editor
Gran Turismo 3: A-Spec ROM/ISO Editor (new version)
Download Gran Turismo 3 Editor ver 1.2 (PS2)
Also available at RHDN with a full description: Gran Turismo 3: A-Spec Editor
Gran Turismo 3: A-Spec ISO Editor (old version)
Download Gran Turismo 3 Editor ver 0.7 (PS2)
Also available at RHDN with full description: Gran Turismo 3: A-Spec Editor
Grand Theft Auto: San Andreas ISO Editor
Download GTA: San Andreas Editor ver 1.0 (PS2)
Also available at RHDN with full description: GTA: San Andreas Editor
PCSX2 Cheat Code Tool
Download PCSX2 Cheat Code Tool ver 1.1 (PS2)
Tool lets you patch cheat codes directly into a PCSX2 save state file (no need to use pnach files).
Version 1.1 update: Can now easily turn cheat codes On or Off, as well as add code descriptions.
Can read more about the tool here: PCSX2 Cheat Code Tool
Resident Evil 4 ISO Editor
Download Resident Evil 4 Editor ver 1.3 (PS2)
Also available at RHDN with full description: Resident Evil 4 Editor
Resident Evil Code: Veronica X ISO Editor
Download Resident Evil Code: Veronica X Editor ver 1.0 (PS2/GameCube/Dreamcast)
Also available at RHDN with full description: Resident Evil Code: Veronica X Editor