Current maintainers and active developers:
API+USB+FPGA+ASIC: Andrew Smith <kan0i {at} kano-kun [dot] net> 1Jjk2LmktEQKnv8r2cZ9MvLiZwZ9gxabKm
Gekko: https://github.com/vthoang

Legacy:
Original CPU mining software: Jeff Garzik <jgarzik@pobox.com>
BitFORCE FPGA mining and refactor: Luke Dashjr <luke-jr+cgminer@utopios.org> 1NbRmS6a4dniwHHoSS9v3tEYUpP1Z5VVdL
Various code: Con Kolivas <kernel@kolivas.org> 15qSxP1SQcUX3o4nhkfdbgyoWEFMomJ4rZ