Blackcoin, VIA, and Pascal. All trade on poloniex.
Bitbay and Ark trade on bittrex.
Xtrabytes is yobit.

ARK has already risen nearly 10-fold in the last 2 months, and same with VIA. I'm a little hesitant to invest in those at this point.
I bought some Bitbay though, thanks for that tip!
SLR seems to be one of the more promising coins for a price boom in the near future.