Where applicable, sites have been translated into English using Google Translate.
(RMXP/VX) A Japanese resource site with the slant on anime. All resources here are good quality. Windowskins are for RMXP for the most part.
(RM2K3/XP/VX) A Japanese site with some stunning graphics for all RPG Maker platforms, from Title/Game Over screens to transitions to message backgrounds.
- Neo RTP (RMVX) - This Japanese site has very few resources on it, but it's mentioned because it's the only one I know of with "school" themed resources, from characters to windowskins.
- Onirology (RPG-Maker) (RM2K3/XP/VX) - A French site with a few resources, but they are quite good, including Windowskins. The site does not appear to have been updated for a while. — English version (Google Translated)
- Zanyzora's RMXP Resources RMXP - Contains a comparatively small amount of resources, but good ones nevertheless. Some are matching sets and some are add-ons too, including ships. It does not appear that the site has been updated for a while.