I use Audacity a lot and it hasn't really changed much over the last 2 decades I've been using it. It's probably the oldest piece of software I still use at lea

I use Audacity a lot and it hasn't really changed much over the last 2 decades I've been using it. It's probably the oldest piece of software I still use at least weekly. It's simple and just works, plus I can use on my Mac, Linux and Windows machines. The other is probably VLC, but I'm not really sure if that's what you're after since it's just a media player.