- Social And MeetupsOakstopOakstop is a social enterprise that uses commercial real estate as a platform for economic development and community empowerment by providing workspace, meeting/event space, and creative space to entrepreneurs and communities of color.
- Science Tech And NatureOhlone Audobon SocietyA chapter of the National Audubon Society. Our mission is to celebrate and protect birds and their habitats in Southern and Eastern Alameda County
- Sports And RecreationOlympic Club TennisTennis has a long history, but the birth of the game played today is thought to have taken place in England. Played on a rectangular court lined for singles and doubles, players wield stringed rackets and hit the ball over a regulation tennis net, which divides the court in two. A point is a single exchange in which opposing players win by hitting the ball within the lines but out of reach of their opponent, or if their opponent hits the ball outside the lines or into the net.
- Books And WritingOne Village One Book Montclair Book ClubOur book club meets monthly at the library to discuss books set in Oakland and the Bay Area or by Bay Area authors.
- Science Tech And NatureOpenOaklandAll-volunteer civic tech collective bridging community and technology for Oakland.
- Science Tech And NatureOpenTelemetry Meetup San FranciscoMonthly Bay Area meetup around OpenTelemetry and open-source observability for DevOps, SRE, and software teams.
- Outdoors And AdventureOutdoor Afro Bay AreaOutdoor Afro celebrates and inspires Black connections and leadership in nature. Our national not-for-profit organization reconnects Black people to our lands, water, and wildlife through outdoor education, recreation, and conservation.
- Sports And RecreationOyster Bay Disc Golf ClubOyster Bay Disc Golf Club was incorporated as a non-profit public benefit corporation to support and maintain the Oyster Bay Disc Golf community
- Outdoors And AdventureOyster Point DragonsA 501(c)(3) all-volunteer dragon boat team founded in 2012 and based at Oyster Point Marina; mission is to promote dragon boating in a fun and safe environment while fostering team spirit and friendship; includes adult, middle school (Tiger Sharks) and high school teams.
- Sports And RecreationPacific Fencing ClubEstablished in 1984, Pacific Fencing Club is one of the oldest fencing clubs in the Bay Area.
- Games And TabletopPacific Mahjong LeagueCompetitive riichi mahjong league using modern Japanese riichi rules with a published rulebook, welcoming both seasoned competitive players and curious beginners.
- Fitness And WellnessPacific Masters SwimmingRegional Masters swimming network for adult swimmers with clubs, workouts, meets, clinics, and social functions.