Claymore said:

"I'm not so greedy as some people say Smiley
It's not about money, there are several reasons why I'm not going to release ZCash miner for Linux in near future - most of haters who say that I stole SA engine are on Linux so let's they use some different miner. Also I don't like to see as someone applies IDA to my miner to see how it works. Also I don't like Linux, it's a pain for me.
NVidia: if I release miner for NVidia, these haters will again say that I stole SA engine. So there will not be NVidia version.
I think other devs will create public miners with similar speed for Linux and NVidia soon."