There are plenty of recent threads on this subject.
There are amps for every price bracket (which you don’t specify).
Class D audio, as mentioned.
Then VTV and several European makes, Nord, Apollon, etc.
Then LSA Voyager, Peachtree, Orchard.
Then AGD (new lower priced amp at 5K), and Atmasphere (also 5.3K) in beta now.
You could also look at Wyred 4 Sound, Mytek, and Bel Canto.