For dev-first environments, I just wrote a simple wrapper for 1password <https://github.com/na4ma4/1password-direnv-tool>, although I found their application SDK to be quite broken (will stop working after a few hours for no idea why), I didn't write it for anyone other than me, so it works fine for my use case :).
I find it super easy to just make a document, and enter key-val details as attributes.
> "Come on," he droned, "I've been ordered to take you down to the bridge. Here I am, brain the size of a planet and they ask me to take you down to the bridge. Call that job satisfaction? 'Cos I don't."
Indie games would be far more of a gamble to buy if Steam wasn't around, and just finding them would be a huge hurdle.