Well there is always jDrones who is THE One and only left from the original team. A member and developer from day -0 of multicopters@DIYDrones / 3DR. jDrones still support whole ArduPilot project every day in many ways and looking more ways to support it. It is still really close to our hearts as we have been there from the beginning.
As said, jDrones is the original creator of ArduCopter platform, it's parts like motors, esc's, powerdistributions, minimosd,... and a manufacturer of various other hardware's. More is coming every day.
jDrones used to sell ArduCopter parts even before 3DR started to sell any, most parts that 3DR used to sell was initiating from jDrones operations.
Also jDrones is one of the founding members of DroneCode and a Silver member:
We used to manufacture APM 2.x boards and were planning to make Pixhawk 1 boards now we are working closely with Philip to make Pixhawk 2 boards on the market so most likely we will not make PH1 for now. If there is enough demand to make PH1, we will reconsider to make those original PH1 boards.
So there you have it. You still have a trusted partner that provides quality parts for all users around the world.
Ps. promoting is good sometimes so let's have it here and now..
With best regards,
Jani / jDrones