here's a beta version of electrum client for yac. most checks are skipped for now and not all block hashes are checked for performance reasons (sometimes it seems like a bad thing that scrypt-chacha is so slow). first you need to compile and install the yac_scrypt python lib (if you use p2pool or something you probably already have it installed).

PS: i really tried to make a windows executable with py2exe, but there's no fucking way i'm gonna get that stupid m$ visual shit to work (needed to compile yac_scrypt)...

PPS: no idea how to get the lib working on android so far, so don't ask me

https://github.com/saironiq/electrum/tree/yac (yes, it's in a special branch; master is vanilla bitcoin electrum)