I was talking with no23/the_fog (the guy who helped bring back online PS2 games such as Resident Evil Outbreak and Twisted Metal Black) and he said that he developed a mostly functional test server for the original Monster Hunter on PS2 (a personal favorite of mine) but never finished/released it.
When asked if the project would ever resume development, he said it could happen if there was enough interest in it. So we created a survey to help gauge interest. If you're interested in playing this game online, speak up! Now's your chance!
https://forms.gle/3rQLpWseQZ5S8WLt6