Safe is a fork of Dashcoin and it is a new currency focusing on encryption and privacy protection. It uses X11 for algorithm like Dashcoin. It can use Dashcoin miners D3, DR100, etc. held by a worker for mining.
BitcoinX (Bitcoin X: https://www.bcx.org/) is a fork of the Bitcoin blockchain at block height 498888. After such forking, 1 BTC will acquire 10,000 BCX candies, and with Blake2b algorithm, this enables the use of GPU or CPU for mining (due to different block structures, A3 and other ASIC miners cannot be used for mining BCX).