Is there a list of add-ons that "we" see as being the most important to move to Python 3?
This is a PyPi query of Plone packages that are Python 3 compatible: https://pypi.org/search/?c=Framework+%3A%3A+Plone&c=Programming+Language+%3A%3A+Python+%3A%3A+3&q=&page=1
This add-on listing is still a work in progress: https://plone.org/download/plone-add-ons/filter_view
https://github.com/orgs/collective/projects/1 is an overview of what people think is important or working on 
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