Use your engineering skills to defend yourself from the zombies!
TF2Stats, alltalk, custom, fun, increased_maxplayers, infect, infection, wonder, wonderlan.tf, wonderland, zombie, zombiemod
Random server mode
This will pick any community gamemode (hence not official gamemode's), and choose a random server from that list with at least 5 players in it. This is the best way to get in touch with the funkiest maps/gamemodes/people!