This is one I found via Reddit that's pretty good:
I haven't messed with the trade functions, but I've heard pretty decent things. Overall, its a solid simulator, although it'll have some rare random mishaps that don't make any sense (Burrow freefalling to the 2nd happened the other day). It's not common, but it'll happen. Otherwise, I've liked how the board is structured and have gotten some really solid drafts from it (by that I mean realistic).