Vanilla Forum is an open-source, standards-compliant, pluggable and customizable discussion PHP forum project,  which especially designed to help small communities grow larger through SEO mojo, totally customizable social tools, and great user experience. Vanilla is also built with integration at the forefront, so it can seamlessly integrate with your existing website, blog, or custom-built application.

Features of Vanilla Forum:
- Simple: clean, friendly design
.Easy-to-read user interface.
.Users are clearly identified by self-chosen photos & usernames.
.Vanilla Forums remember what you've read, and bring you right where you left off upon return.
.Easy, in-line editing & deleting permissions for administrators.
.User comments allow for live previewing, drafting, and auto-saving.
- Customizable: quick and easy ready-made themes
.Review your currently chosen theme.
.New themes added regularly.
.Preview and apply themes with a single button-click.

Requirements:
- PHP version 5.2.0 or newer
. file_uploads = on
. PHP Data Objects module
. PDO_MySQL module must be enabled
. GD version 2.0 or newer (optional, but required for profile pictures)
. cURL or Sockets (to allow plugin sandboxing)
- MySQL version 5 or newer
- Apache version 2 or newer
. AllowOverride = All (optional, but it allows friendly urls)
. mod_rewrite (optional, but it allows friendly urls)

What's New in This Version:
- This release fixes a security hole in Vanilla that can leave your forum open to XSS attacks.