It's not officially out yet, but you can now jump in early to Soulframe, the in-development action RPG from the developers of the popular Warframe. A Steam page is also now live that you can follow it on, for whenever it actually releases properly. Considering it's from the Warframe developers, I expect it to be another big one.
Not heard of it? An open world fantasy RPG adventure with themes influenced by nature and restoration. With a hand-crafted world you will explore an "ancient, broken land and inherit the courage, spirit, and grace of Ancestors to mend earthly flesh and heal its land from Ode’n reign".
Announced on the official forum, founder packs for it are also now live so you can purchase it to get into it early. Until now, you had to sign up for a chance to be invited via email, so you can skip all that if you really want to get in on it during development. It's not cheap though, as getting all three of the characters appears to be £84.99 with them £24.99 individually and you get an assortment of extras with them too. At release much like Warframe, it will be free to play.