WebPageOne Solutions highly recommends the following products based on functionality and cost.

Forum Software by vBulletin Features templates, import messages from other systems, search, unlimited forums, email notification, smilies, user profiles, moderators, user groups.

Directory Software by phpLD is now the most widely used directory script on the Internet. ... Another great advantage of phpLD is the number of templates and mods available.

SEO Software  by Web CEO (website optimization, submission and promotion software). SEO Software 'Web CEO' includes 12 SEO Tools in One Powerful SEO Suite.

Keyword Research Tool - Use Wordtracker to discover the best keywords for your website.