Here are games I am very familiar with outside of Vassal but have never played online:
Risk
Tactics II
Axis and Allies original
stratego
I have played Circus Maximus one time with vassal and enjoyed it immensely.
I have read the rules for gladiator, zombie plague. and gunfighter,and would like to play those.
I would like to have someone teach me richtofen or aces.
Central time
Any weekday evening except Wednesday