Is there a list of apps integrated with Agenda, beyond Reminders and Calendar? This would include anything using the API option.
I’ve moved this to the Shortcuts section, leaving it up to others to mention which apps they have Agenda set up to work together with.
As I know, we are still waiting that Spark confirms the integration with Agenda after a request for it. However, It is already possible to have good integration with Spark through Reminders. It is possible to share Bear files on Agenda, but not vice versa ( I do not know why).
It is possible even to share Agenda files on Devonthink 3 and vice versa.
These are some examples, but I think the situation is in evolution, and other apps can perform this kind of integration.