itch.io

I think Tiled2Unity is probably what you're looking for. It's up to date with Tiled's features and well maintained. There are a bunch of other options though, which may be more suitable depending on your needs.

Back when I still used Unity I found UTiled to be the most convenient free option. It has its limitations but suited my needs at the time.

I switched to Urho3D a year ago which has built-in TMX support through C++ classes. It's library is very similar to Unity's yet allowed me to return to Linux.