There are several options - website APIs, ODCB, plugins, AppleScript, etc
If you mean reach into a closed FMP database, no, I do not know of any. Even Bento by Filemaker could not do that.
Applescript and others can tell Filemaker to give them info.
More specifics would be useful in answering the the question.
The way I was thinking about it was; If you were in a program that supports hyperlinking like OneNote you could create a hyperlink that would open the database and go to the related record. I see a way in FileMaker to do this with programs that support it, and now I want to go the other way around.
I found information about Snapshot Links and this is a good choice to do what I want.