Every game that's been published is literally a fan game or something like it.
This isn't a hit on all the DBZ games, it's a question, actually... Who's working on an original game, with an original plot? When I first came to BYOND and saw the Games Live page, I was all like "whoa, what's with all the fan games? Is that all you can do?" But I was thinking that it'd successfully change over time, but I was wrong. Leftley, Skysaw, Wildblood, LostRealm(Lord Raven), and Volte(with his new rpg) are the only people I can name with brief browsing.