Awesomeminer and HiveFarm violate the cgminer license since.
They have firmware that runs with their software that violates the license.
I've no idea about the other two.
This one violates the cgminer license also since they provide a firmware without the miner source code.
There is custom firmware by the name "Luxor Tech" which I believe belongs to Luxor, so this makes 4 of them.
OP, I use AwesomeMiner and it's great, I have checked Mineitor and it looks as
Awesome as AwesomeMiner.