YetAnotherForum.NET (YAF) is the Oldest, Most Mature, and Feature Rich Open Source (FREE) Discussion Forum for sites running ASP.NET. 100% written in C#, YAF (pronounced like “laugh”) is a unique combination of Open Source, Microsoft’s .NET platform and an international collaboration of the .NET developer community.
YAF runs on any web server that supports ASP.NET v3.5 SP1 (and above) and has SQL Server 2000 or greater installed. YAF is GPL licensed. Some features:
Issolated CSS theming system: won’t conflict with an existing site.
True ASP.NET Membership/Role/Profile Provider support — no depedancies.
Runs as a User Control (.ascx) in .NET allowing simpler site and CMS integration.
Advanced avatars support including Gravatar option and automatic thumbnailing.
Dynamic plugin engine allowing module extensions.
Many SEO features including dynamically generated meta tags on topic pages.
User configurable cultures. See dates and numbers the way you are used to.
Includes private messaging and private messaging notification features.
Possibility to hide forums when user has no access.
Unlimited user groups, with option to automatically promote users based on number of posts.
Access rights based on groups.
Polls can be added to posts.
Administrators can mass email to all users or specific group.
Template for easy integration with your current site design.
Web based administration.
Setup moderators with the ability to moderate topics, posts and users signatures.
Email notification for moderators with users post in moderated forums.
Watch forums or topics for new posts.
View and delete subscriptions from the user control panel.
IP banning and user “kill” system.
TinyMCE editor included as an option.