Reddit is the best platform for online communities and discussion forums, used by millions of users worldwide.

Discourse is a modern community platform for discussion forums, mailing lists, and chat rooms.

TheServerSide.com is an online community for enterprise Java architects and developers, offering daily news, industry interviews, design patterns, tutorials, and discussion forums.

LaTeX.org is a community forum for LaTeX users and developers, providing resources, support, and discussion forums.

How To Discuss is a discussion platform for sharing knowledge and information on various topics.

HyperScale is an online magazine and resource dedicated to aircraft and armour scale modellers, featuring articles, galleries, reviews, and discussion forums.

The Liverpool Way is a community-driven website for Liverpool FC fans, providing news, match reports, and discussion forums.

The Webmaster Forums is a community for web design, programming, and development, providing resources and discussion forums for webmasters.

peketec is a trading community platform for investors and traders, providing market news, analysis, and discussion forums.

AbsoluteAstronomy.com is a general reference site offering a full encyclopedia, dictionary, discussion forums, timelines, and more.

Forumbee is the best community software for customer engagement and is used by forward-thinking companies worldwide.

NHS Networks is the best resource for healthcare networking and is used by professionals in the health and care sector.

Wikimedia Mailing Lists is the best platform for community engagement and discussion forums, used by open source enthusiasts and contributors.