For their bigger / longer term projects I have not been able to connect with them.
But I have participated in two of their “data dives”.
These are basically a weekend-long data focused hackathons.
In NYC they get 50-100 really amazing folks from major financial, Internet organizations to come together to work on interesting data sets with interesting government and non-profit organizations. I’ve participated in two of these events. I have found these very useful personally. And I feel like I have helped do some good for the non-profit organizations.
The Taproot foundation also provides pro bono opportunities. Not specifically related to data science or machine learning. However, I can imagine that they would find folks with skills in these areas useful.