Actually, funny you should mention it. I've been working on a new project that hopes to eventually make PMD games accessible to lots of others, called the PMD Community Project. We've got a few games signed up as partners, all of which are making their own PMD MMOs based on the PMDCP Core (which is going to be released to GitHub soon). Also, we have sprites and other resources if you want to make your own game.
Website is still being renovated, but you can check it out here: pmdcommunity.eu
The partner games haven't been added yet, but they will be in the coming week.
Other than that, there's also my main game I focus on: Mystery Dungeon eXtended. It's built differently than most others; it's developed in a style similar to a wiki, allowing the community to work on all aspects of the game with few barriers. Download for that is on the website I posted above.