Recommended and mentioned products
Ocenaudio is a cross-platform, easy to use, fast and functional audio editor.
Audacity is a great project and I’m very glad it exists.
Personally I only need pretty basic wave editing and am happy with OcenAudio (https://ocenaudio.com - free but closed source), it’s the closest thing I’ve found to Cool Edit 2000 (which I still think is the best wave editor ever!) and has quite a nice UI.