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For remapping keys/buttons I use Input Remapper (https://github.com/sezanzeb/input-remapper/); It's on the AUR.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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I've been using https://github.com/PixlOne/logiops for 2 years without any complaints but my requirements are not complex. Just one remapping on a mx master 3 mouse to make the "thumb" button (not sure what's its called) invoke 'super + d'. If I recall correctly though it was also required to get the forward, back and scroll side buttons to work.
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Hence, a higher number means a more popular project.