I am running a custom game using the S6S system. The rules for which can be found at <a href="http://www.s6s.ie.com" rel="nofollow">http://www.s6s.ie.com</a> although I am in the process of altering and simplifying them. If you are interested in trying a simple system that revolves around a single d6 the campaign link is <a href="https://app.roll20.net/lfg/listing/10225/summum" rel="nofollow">https://app.roll20.net/lfg/listing/10225/summum</a>