With so many threads to follow now I wanted a quick place to provide updates for support for open-source AMD GPU mining on Linux. To my knowledge this is where we currently are:
Zogminer fully working on Linux
Genoil's ZEC Miner only Windows currently but Linux planned?
Coinsforall.io Miner works and is stable but no stratum support and closed pool.
Nicehash working Windows GPU miner and port to Linux is underway
Claymore Working Linux miner (includes a 2.5% fee) but latest version not for Linux
Silent Army Linux miner, well supported and stable - currently on version 5
Optiminer New entry and fastest speeds (by a distance). Currently closed source, includes a dev fee and not as stable.
ethOS now supports Zcash with 1.1.4 running Silent Army (you need to update it to use version 5)
ZogOS is in active development from those that brought you Zogminer
Best option currently is either Silent Army or Optiminer if you want the best possible speed
If anyone has any meaningful additions or updates then please add below and I'll try to edit this post to stay up-to-date with developments.