Neural Amp Modeler
Free amp based on the Neural network emulator for guitar amps
Neural Amp Modeler is a free amp modeler developed by Steve Atkinson. Users can profile their own amps, pedals and any other equipment they see fit. You can also download a large number of these profiles and models for your own productions. Available in VST3 and AU plugin formats.
In essence, it works similarly to Kemper, Quad Cortex and any other modeler that uses amp profiles instead of algorithmic processing. You get the advantage of superb response, which amp simulators often lack.
The community around NAM has built an impressive collection of models, which can be found in this handy repository on GitHub.