I seem to remember someone else releasing asic or fpga code for cryptonight once monero announced the first fork.  They had been working on it privately and realized that it would be obviously worthless so they released it as kind of a learning tool/proof-of-concept.  Unfortunately I can't find the link anymore, but it was on github.

Here is a good post about why an open source asic would never work though:  https://thebitcoin.pub/t/build-your-own-asic-miner/14173/462