History of the codeΒΆ
The C++ Ethereum project was initiated by Gavin Wood, the former CTO of the Ethereum Foundation, in December 2013. It is the second most popular of the clients, trailing a long way behind the dominant geth client, also built by the Ethereum Foundation.
Many of the original C++ developers moved on to roles at Slock.it and Ethcore in late 2015 and early 2016 following a 75% cut in funding for C++ development. Those cuts were part of a broader effort to bring Foundation costs under control, and they happened prior to the recent spike in ETH value which has put the Foundation in a much more comfortable financial position.
See Contributors for the full list of everybody who has worked on the code.