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I sometimes use Sheets in Word to show developer artifacts and how they are connected (maps, diagrams, pipelines ...) and include a verbal description / comment for each.
I agree with HSedidin above that BPMN may be worth a try, but even that, the audience will have to learn.
There is a βStencilβ package for BizTalk available for Vizio here: https://gallery.technet.microsoft.com/Collection-of-Visio-2013-0283d5f4 , but I have to admit that I haven't used it yet.