My personal charitable support goes locally in my neighborhood, like a lot of people, and internationally to Save the Children, who I just think do really good work.
As far as individual tech projects, I think the selection of a charity is a very personal thing, it’s whatever speaks to you. So whether it’s something to get kids interested in robotics, scholarship funding, clean water, job training for people coming out of prison, accessible technology, whatever. If you feel the connection and you can help, go for it. 
Want to do me a favor?
Actually, if anyone would like to do me a personal favor, I’d really like to see people “pay it forward” by contributing an article to the new community-created wiki.
If you have a device you’re happy with, including one of the officially supported devices, you could help us all by creating the device page for it in the wiki so others can find out about it more easily. (Or if you have a device you hate and you want others warned! 
) There’s already a template, so it’s just filling in a few details. The wiki is for the factual descriptions, but you can include links back to the forum threads for discussions and opinions.
Or any other SmartThings-related topic where you feel the wiki needs expanding.
Also feel free to take any of my FAQs from the forum that aren’t already moved over and copy them into the wiki. Copy and paste is really hard for me, so that would be doing me a serious favor.
One of those many hands make light work, and the more people participating the better!
Announcement of the new wiki project here: