There really should be a free and open source alternative for Duolingo. I know that there is Librelingo, but that is currently only doing Spanish for English speakers.

If you want to use Winamp on a modern PC, just use WACUP: https://getwacup.com/

It’s a nearly perfect clone of the original Winamp and does work exactly as it should without all this NFT bullshit the new Winamp “promises”