This is a list of all utilities for RM2K3, including the current version. They are available for download from RPG Maker Times.
RMRecker, created by AnomyWare, is specifically designed for "editing resources, such as splash screens, icons, and glyphs, in your RPG Maker games quick and easy". With it, you can change any of the three logos, the glyphs and icons used in the game with your own, then save them. The way that RMRecker does this is it patches the EXEcutable RPG_RT file, overwriting the "defaults". It certainly is a quick and easy process and, although it was created with RM2K/3 in mind, it can be used with other EXE files as well. There are some limitations: You can only use 8-bit images. It won’t accept 24-bit high color images unless...
This utility scans RPG Maker games for missing files and gives instructions on how to fix it. For example, if a MIDI or particular graphics file is missing from the game’s Project folder, this tool will tell you which one is missing. *Note: The program was made specifically for RM2K, but works as well with RM2K3, except for 2K3-specific folders (i.e. System2, BattleChars, CharSets, etc.); they just won’t be scanned. If any files are missing, you can then import those resources into your project. The program will then "fix" the missing files.
This utility allows you to create charsets from scratch or modify existing charsets. It’s basically the offline version of Charas.EX website. The program can be downloaded from Charas Project or charsets can be developed online at here.