MegaMekLab is a Mek creator program. Currently it can create Meks, vehicles, battlearmor, and conventional infantry. It can also print PDF record sheets for almost all Battletech units. Created units can also be exported to formatted text or html for posting online.
MekWars is an online campaign system that allows players to connect to a server, join a faction, and compete against other players. Click here for a list of all current MekWars servers.