tbaMUD Continued development of the CircleMUD core

Besides killing mobs for experience, are there other ways? Perhaps completing quests?

You could use the nop command in a trigger to give more experience. The only down side to the nop command is I think the maximum it can give at one time (by default) is 100 XP. You can however modify the code to change that. The max 100 limit is a security 'feature', but I believe most of the exploits have been worked out.

You could also code a proc to do it.

I believe tbamuds quest system allows you to reward experience for completing the quest task. Along with items and what not.

Yup, what they said.