macOS has Services, which I think are meant to serve much the same function. https://developer.apple.com/design/human-interface-guidelines/macos/extensions/ser

macOS has Services, which I think are meant to serve much the same function. https://developer.apple.com/design/human-interface-guidelines/macos/extensions/services/ https://developer.apple.com/design/human-interface-guideline... (EDIT: I was "posting too fast". In the meantime, I think that jasomills has pointed this out (https://news.ycombinator.com/item?id=31305652 https://news.ycombinator.com/item?id=31305652).)