RPG Maker Magazine is an online magazine dedicated to “console RPG Maker games”, especially RPG Makers 2 and 3 for the PS2.
Not only that, they do have an active forum, which also contains some (though not much) content on the PC version RPG Makers.
There are some interesting articles in its online magazines as well, although this part of the site doesn’t appear to have been updated in a while. Notwithstanding, it’s still worth reading through them.
The list of games in the “Game Vault” is quite comprehensive, including RMXP and RMVX projects. And, of course, there’s the inevitable guides and tutorials, including the game manual.
Overall, the site doesn’t have much in the way of active content or updates – for all intents and purposes it’s inactive – but it’s still worth a mention solely based on its content and list of games. (I spent at least 90 minutes browsing through.)