I use a variety of kilns:
My main workhorse is Ray Scott ‘Sayvit’ propane gas kiln, which I fire to cone 10 (about 1300°C) with a ‘reduction’ atmosphere. I also have a smaller gas kiln of a similar design.
I have a small Raku kiln made by Ray Scott (when he ran Fordham Thermal Ceramics).
I also have a small electric kiln, which I use occasionally for biscuit firing and glaze tests.
Sometimes I smoke fire pots in an old oil drum, though it’s debatable whether I can call that a kiln.