Teya Conceptor is almost free. Time of session is limited, but you can just restart program to work again.
(for more difference between free/pro see faq)

Teya Conceptor for Windows Teya Conceptor for macOS

Download

Download

mirror

mirror

portable (.zip) version
(same as installed, unpack instead of installing)
at macOS Big Sur, use launch this way:
finder/programs + ctrl to open
don't install it to "program files" folder!
use c:\Teya Conceptor\ (as default or any nonsystem folder)
"Allow apps downloaded from anywhere"
must be enabled in Security and privacy