Viacoin.  This is the only alt besides monero that I'm currently watching and take seriously.  Another smart coin developed by btcdrak in the same vein as counterparty but without all the btc drama that comes with it.  Peter Todd was hired to help with the design and is going to be implementing tree chains into the Viacoin network which he believes will solve the 51% attack problem.

You can find the relevant info here: https://bitcointalk.org/index.php?topic=699278.0

The developers bring the same level of quality and commitment that the monero developers have brought to XMR imo.