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 grater installed. YAF is GPL licensed. Some features: # Uses AJAX and jQuery for controls.
# Microsoft SQL Server 2005/2008 database support.
# 100% XHTML Validated.
# 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.
# Instant Chat System with Flyout.
# "Thank" other user system for more participation -- includes reporting.
# Individiual user graphic "Album" system with automatic thumbnailing feature.
# Advanced avatars support including Gravatar option and automatic thumbnailing.
# Custom "BBCode" extension system allowing adding of community features.
# Dynamic plugin engine allowing module extensions.
# Many SEO features including dynamically generated meta tags on topic pages.