Frauc brings both sales and auctions to the same site. You're welcome. Now, you just need to decide which is the best fit for your item.
Sales are great for those items that are worth something, but not in high demand by a lot of people (ie dresser, some cars, old teapot). If your priority is to sell it, more so than receive the highest possible price, then a sales post is probably a good fit.
Auctions are for the high demand items that are either difficult to come by or one of a kind. You'd rather get the premium price than sell to the first bidder. Think items like: Samsung Galaxy, Coachella tickets, a BMW motorcycle.
New to auctions? Don't hesitate, you have control, and don't need to accept any ol' offer that comes your way. You set the reserve price, bid increment and timeline, and still maintain ultimate authority on accepting a bid.