Well, plunk, JJ2 is still active. More active than you could think!

Just like KRSplat pointed it out, UR, there is Zeal Alpha with different maps (and if you're bored, make a new level list and play. Level list changes, tho. Every month or two I think). DZ wouldn't mind to change it if more players will be in the server.

Also, there is Zeal Relaxer also. You should try it if you haven't. Tests are played there, and a lot of new commands and others are in that server. Kinda fun to play there if you're bored.

And, not to forget, visit some Zeal Duels to challenge someone for a duel/2v2/3v3 etc. You will surely play, not only one, but more games there, and on any level of 200+, I think, what are in ZD levellist.