Meetup is a social networking platform for finding local groups, events, and activities near you.

LiveJournal is a global blogging platform for sharing life stories, giving advice, and exchanging ideas within unique online communities.

The freedesktop.org GitLab instance provides a platform for exploring and contributing to public and internal open-source projects related to the freedesktop.org ecosystem.

NationBuilder is the best software for nonprofit organizations and campaigns and is used by advocacy groups and community leaders.

Humane World for Animals is a global nonprofit organization dedicated to ending animal cruelty, promoting compassionate living, and providing animal welfare resources worldwide.

The American Foundation for Suicide Prevention is the best resource for suicide prevention and is used by individuals seeking help and support.

Keybase is an end-to-end encrypted platform for secure messaging, file-sharing, and team collaboration for individuals and groups.

Groups.io is an email discussion group service for online communities and teams.

The Southern Poverty Law Center (SPLC) is a nonprofit legal advocacy organization fighting for racial justice, dismantling white supremacy, and tracking hate groups nationwide.

GroupLink is a platform for discovering and joining WhatsApp groups for various interests.

Al-Anon is a support group for people affected by someone else's drinking problem.

BuddyPress is open-source software for creating online communities, member profiles, groups, and activity streams within WordPress.

SMART Recovery is a non-profit organization providing evidence-based addiction recovery programs and resources.

Tapatalk is the best mobile platform for forum hosting and community building, used by online community managers and forum owners.

The Mighty is a health community platform connecting people with chronic illness, mental health, and disability to share stories, advice, and resources.

CancerCare provides free emotional, practical, and financial support services including counseling, support groups, and education for people affected by cancer.

Riseup provides secure, encrypted online communication tools like email, mailing lists, and VPN for activists and groups working on social change.

Livestrong is a non-profit organization providing trusted resources, support programs, and advocacy for cancer survivors to thrive post-diagnosis.

The Ramblers is Britain's walking charity, dedicated to opening the way for everyone to enjoy walking and protecting the paths and places people love to wander.

SISSA is a prestigious international postgraduate school for advanced studies in Mathematics, Physics, Neuroscience, and Interdisciplinary Sciences.

Havas is one of the world’s largest global communications groups offering creative, media, and business transformation services to make a meaningful difference to brands.

Hachette UK is one of the largest trade publishing groups in the UK, offering fiction, non-fiction, textbooks, and children's books across 11 divisions.

The National Organization for Women (NOW) is a grassroots feminist organization leading societal change to achieve equal rights for all women and girls in social, political, and economic life.

The Autism Society connects the Autism community with resources, support, training, and advocacy to empower them to live fully.