An all-in-one editor for Golden Sun: The Lost Age, that is also compatible with the original Golden Sun.

Editable:

• Items
• Ability stats
• Party Member stats, battle sprites, and starting equipment
• Classes
• Djinni & Summons
• Enemies
• NPCs on maps (Just some basics)
• Hex code for maps
• Text

Just Viewable:

• Maps (including disassembled code data & tilesets)
• Sprites

Code Patches:

• Change Maximum party member name length
• RNG Patch (Attempts to fix the predictability of the Battle RNG that people take advantage of)
• Class separation patch (Allows all party 2 characters to have separate classes from party 1)

The program is unavailable here but can be downloaded at this location - http://forum.goldensunhacking.net/index.php?topic=1.0