HashtagCharity is a good source of dev-centric volunteer opportunities (https://hashtagcharity.org/ https://hashtagcharity.org/). If you don't mind wading thro

HashtagCharity is a good source of dev-centric volunteer opportunities (https://hashtagcharity.org/ https://hashtagcharity.org/). If you don't mind wading through non-tech opportunities, you might get lucky at Reddit /r/nonprofitprojects (https://www.reddit.com/r/nonprofitprojects https://www.reddit.com/r/nonprofitprojects), Idealist (http://www.idealist.org http://www.idealist.org), or VolunteerMatch (http://www.volunteermatch.org/ http://www.volunteermatch.org/). If you want to focus on helping early stage, tech-driven nonprofits, I'd recommend searching through the portfolios of Fast Forward (a nonprofit accelerator) and the YC nonprofit program and reach out directly to any nonprofits you find interesting. Fast Forward: http://www.ffwd.org/tech-nonprofits/ http://www.ffwd.org/tech-nonprofits/. YC Nonprofits: https://github.com/smartergiving/open-data/blob/master/v0/funder_highlights/y_combinator.json https://github.com/smartergiving/open-data/blob/master/v0/fu... Personally though, I've found getting to know a local nonprofit can be most rewarding. In my experience, almost all nonprofits can use a soundboard for general web development...feedback on an agency's statement of work, integrating 3rd party donate buttons, assessing new CMS's, etc. If you have the time to do the work yourself, all the better. Good luck!