pgAdmin 3 still exists and afaik remains compatible with newer Postgres releases. You can still use it.
Postage, a tool developed by a family of software devs, was gaining popularity but recently became unmaintained without explanation (afaik). [0]
I started using IntelliJ DataGrip on a trial basis and it's good, but I probably won't pay for it. Sick of paying monthly subscription fee for every little tool I need from JetBrains, especially when I put down a project and don't need that tool for another x months.
Used DBeaver briefly but it's so many clicks just to set up a primary key that I shelved it for now. Will probably come back to it when DataGrip trial is over.
Not a conventional management tool but pgModeler [1] is a cool project IMO. Open-source, but they put a limit on the Windows binaries they distribute to try to get people to fund development. Can build from source yourself, install on Linux, or probably find free third-party builds elsewhere.
I think that most devs are just sticking with pgadmin3.
[0] https://github.com/workflowproducts/postage
[1] https://pgmodeler.com.br/