Eligius
Eligius is an open mining pool that can be joined by anyone without registration. Unlike other bitcoin mining pools, Eligius doesnt charge fees, and it manages under the CPPSRB reward system at 100 percent value. Miners are typically paid directly from the block reward, which means that Eligius almost never keeps any funds in its internal wallet, making it highly transparent and unattractive to hackers. Because Eligius isnt profitable for its operators, it offers only basic functionality.