Myriad, a 5 algorithm POW coin, is inching closer to adding the Equihash algorithm and possibly replacing the Skein algorithm in the process. The move is being made in hopes of pulling power from ASICs back to GPUs. The change would be done by consensus and is being labeled as MIP1 (Myriad Improvement Proposal).
Equihash is a memory-oriented Proof-of-Work, which means how much mining you can do is mostly determined by how much RAM you have. This should prevent any ASIC development around Equihash for the foreseeable future and will open up Myriad to a larger audience of GPU miners.
From the pull request:
Myriad strives to have a balance of ASIC, GPU and CPU algorithms. At the moment the balance has shifted to ASIC algorithms. The Equihash algorithm is proposed as new algorithm to shift the balance back towards GPU mining.
Equihash is added as the seventh algorithm with ID 6.
The Solution variable is conditionally streamed for Equihash blocks to include it in the hash.
It is assumed the algorithm change will be introduced through the version bits consensus mechanism.
Current reference implementation does not yet address introduction of the new algorithm nor retirement of an existing algorithm.
You can read more on the pull request here: https://github.com/myriadteam/myriadcoin/pull/85