We have several systems, and in those systems we use primarily Crest (old stuff) and Carver (also old). So, add into your tally 16 Carver amps (PM600, PM900, PM1.5, PT2400) and 3 Crest amps (3501S, 5000). Those are the ones on the road in DJ systems.
In my band playing days, we used Peavey CS-800's, then bought Crown DC-300A's; that was from 1969 until 1987. Once I started DJ'ing (1987), I had various model QSC's starting with the old Series1 1400/1700, USA-900/1310, and then onto the PLX's 1(2402), 1(3002), 3(3402's). I still own the PLX's but I've switched to Mackie 450/1500's, then EV SXa-250/180's and now have EV SXa-360/750's.
I use a QSC PLX-3402, an Ashley MFA-8000, and a Carver PM-1.5. The QSC and Ashley get regular use, while the Carver is a backup that I take gigging once a year to make sure it's still doing its thing. (The Carver is from the 1980s and has never stopped doing its thing.)
Depends on the application. I switched to the PLX 3002's for the weight when we moved the K2's to an install. So mobile applications the QSC PLX or PL line and install the Crown K Series or Macro Tech sereis.
The interesting thing is that... I had used a SoundCraftmen amp it was the most powerfulll i think it was 5000 it weighted a ton it was Class H amp, Very Efficient on delivering raw power. But no fans i didn' like that Idea the heat sink were on the back where the out put stage transistors were mounted. It couldn't handel 2 ohm load or Monobrige at 4ohm load it got so hot that you can fry an egg on those heat sink. Things improve now a days.
EDIT: i noticed the subject says "use" and not "own" so i'll just say, that i have used the QSC PLX series, Crown MT, and K series, a hand full of Peavey amps, a Yamaha amp, Crest amps, and a few more.