- LibreHealth, http://librehealth.io/
- Wikimedia Foundation, http://wikimediafoundation.org/
- Mifos, http://mifos.org
- UCSC Xena, http://xena.ucsc.edu
- Systers, https://anitab.org/systers/
- Sugarlabs, http://www.sugarlabs.org
- Oppia, https://www.oppia.org/splash
- Open Street Maps, http://www.openstreetmap.org/
- Open MRS, https://openmrs.org/
- Open Census, http://opencensus.io
- Open Astronomy, http://www.OpenAstronomy.org
- Open States, https://openstates.org
- Open Food Facts, https://world.openfoodfacts.org
- Open Data Kit, https://opendatakit.org (Open Data Kit is used to collect data for social good in difficult environments.)
- languagetool.org, https://languagetool.org
- CiviCRM, https://civicrm.org
- CHAOSS, https://chaoss.community/
- Carbon Footprint, https://gitlab.com/aossie/CarbonFootprint
Open Humans https://www.openhumans.org/ may have some interesting projects under their umbrella.