The longest serving league in Mechwarrior/Battletech online gaming, Netbattletech is looking for additional Clan units to take on the mantles of various Homeworld factions in its 3062 campaign.
https://www.netbattletech.com
http://www.nbt-mwo.com/forum/index.php
The various Homeworld Clans represent an opportunity for smaller units with less or no competitive experience to get introduced to the best version of faction warfare available, representing one of the many minor Clans struggling over limited resources, hoping to break out and eventually earn their way into the Invasion Corridor for honor and glory.
Available factions include:
Clan Steel Viper
Clan Cloud Cobra
Clan Ice Hellion
Clan Blood Spirit
Clan Hells Horses
Clan Coyote
Clan Fire Mandrill
And soon to be available due to a unit moving to another faction, Clan Goliath Scorpion.
If you are interested in an environment where matches do more than change colored dots on a star map, where resources matter, most DROPDECs aren't "meta" due to production scarcity, where player driven politics and a true sandbox for MWO exists, take a look at NBT.