Although not technically free, I would add Reaper to the list for audio editing. It gives you a pop-up asking if you want to buy the program, but it’s not required. I know people who have been using it for years without actually purchasing it. (I have since purchased a license because I use it professionally). No features are locked behind the paid license.

For me, Reaper without a doubt. I’ve been doing audio work for the better part of a decade now it’s become my main DAW of choice for the last 5 years. Technically a license costs you $60, but every feature is available in the “trial” version that never expires. SWS script support and the insane amount community skins/extensions makes it well worth the $60 if you plan on buying. I’ve replaced many ProTools with Reaper setups…