I believe Usurper and Legend of the Red Dragon are still running somewhere. They’re basically just old DOS games running on someone’s computer you dialed into.
I remember years ago someone made a PHP version of Legend of the Red Dragon, I think it was Legend of the Green Dragon if not mistaken. I wish I still had my original registration code that was mailed to me and signed by Seth Robinson.
I remember playing an Eragon version of this game when I was a kid. I couldn't figure out what the software was for years, and finally figured it out a couple years ago. Unfortunately I couldn't find any information on the specific instance I played, but it was nice to get an answer :) Good memories there