I recently found a list of battletech related sites, but it’s a mixed bag of resources.

• battletech.com – The official Site with products, a forum, errata and downloads.
• sarna.net – Best site (wiki) I’ve found for Battletech based information from mechs to history to the worlds.
• battletech.rpg.hu – A Hungarian site with an excellent set of resources, and they run the Mech Factory Android app.
• battletechuniverse.com
• dropshipcommand.com – An old site, that no longer seems active.
• megamek.info – An unofficial digital version of the board game
• mwomercs.com – Another online version of the computer game
• ourbattletech.com – Has an alternative Clan arrival history and some other good resources. Read Renegade Tech V2 if you want alternative damage rules for Battletech.
• solaris7.com – a useful grab bag of unit statistics.
• lordsofthebattlefield.com – an online battletech community specializing in miniatures, mech design and tactical superiority.
• nogutsnogalaxy.net – an odd collection of videos and media which seems to point to mwonline.