vBulletin is a professional, affordable community forum solution. Thousands of clients, including many industry leading blue chip companies, have chosen vBulletin - It's the ideal choice for any size of community.

Millions of people use phpBB on a daily basis, making it the most widely used opensource bulletin board system in the world. Whether you want to stay in touch with a small group of friends or are looking to set up a large multi-category board for a corporate website, phpBB has the features you need built in.

As the very core of Invisions Community Suite package, they've made sure that IP.Board is an outstanding bulletin board system. The result of over seven years experience in developing bulletin board software, IP.Board brings powerful and practical features while remaining intuitive and flexible - and it's now blazing fast too.

WordPress.com is brought to you by some of the same folks who work on the open source blogging software available at WordPress.org. Open source WordPress has been incredibly successful and risen from a handful of users to the most-used blog tool in its category.