Custom Quest is a quest system we have been working on for the past 2 months. It aims to fulfill any needs a developer could have for a quest system, and will of course play a major role in our upcoming title, Quest Accepted.
One of the major features of the system, is the ability to easily expand and customize each individual quest as needed. The user can even add new code, without touching the core!
It is planned to be release on the asset store in June.