Hello,
My fellow Zcashers and I are looking for an interested developer or group of developers that have the skill set to develop a GPU miner for Zcash's Equihash algorithm. Several people have offered to donate bitcoin for a Open Source/public solution to this problem. Here is a forum thread from Zcash forum stating everyone's intent:
https://forum.z.cash/t/crowdfund-gpu-miner/1324/105
Currently, one individual that I'm aware of (Ampy) has created a Zcash GPU miner and has opted to sell to a mining farm privately. Funds from the crowdfund were supposed to pay for the release of the miner to the public and potentially open source it, but it appears that negotiations with the public have fallen through.
If any interested developers can prove or provide a GPU miner by launch or shortly after launch we will organize and transfer the funds accordingly.
Please feel free to PM me for more details.