All the services registred as described in this article https://robservatory.com/the-useful-yet-useless-services-menu/. I do not share the views of the author of the article when he says it is useless. In our case it is a perfect entry point for many text app, for instance, check speller. I’m French and most check spellers do not fit my needs (I use Antidote which can be added to the services menu precisely)
The official entry point for services in Apple developer https://developer.apple.com/design/human-interface-guidelines/macos/extensions/services/
Thanks
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