Features:
Urls:
Master Switch to Disable Pretty Urls in All Forum
Optionally Permanent Redirect (301) Old Urls to the New Urls Format.
Easily Customize URLs Format of Boards, Topics and Profiles. (Ex. Select if boards would be b{board_id} or b{board_name}_{board_id}) from Admin Panel.
Hierarchic URL Structure: URLs would follow a pattern, so you can easily go to the board of a topic just removing the topic part of the URL. Just like folders.
Friendly Urls for Boards
Friendly Urls for Topics
Friendly Urls for Profiles
Friendly Urls for Actions
Friendly Urls for Attachments
Limit URLs Lenght
Parse acronyms on Urls
Stopwords on URLs
Custom Stopwords
Google Analytics Integration:
Google Analytics Graph on Admin Panel.
Check Analytics Data in Years, Months or Days

Check Additional Data including OS, Keywords, Referrer, Browser and Screen Resolution

Secure Google Analytics Integration in Admin.
Easily integrate Google Analytics in your forum.
Optionally track external links with Analytics.
Optionally anonymize IP's while using Analytics.
Sitemaps:
Enable Sitemap.
Enable Sitemap XML.
Set Topics Showned per Page.
Select if Sitemap link will be showned in Menu, Footer or Both.
Ping Sitemap.
Linksbacks & Pings:
Linkback: Simple URL showned in first post to avoid illegal copy of content via RSS Feeds.
Pingbacks: Pingbacks can be enabled to notify search engines about new content.
Set Sitemap Ping Frequency.
Enable Sitemap Pings for Google, Bing and Ask.
SEO Cloud:
SEO Cloud: Increase SEO with a Cloud of tags based on keywords of words used by people to get to your website using major search engines.

SEO Cloud can be shown in Topics, Boards or Forum Index.
Keywords from all popular search engines is included.

Additional Search Engines can be added easily.

Topics:
Show Signature only once per page for Guests.
Related Topics. (Using Fulltext on MySQL).
Set the number of topics showned in related topics.
Replace Previous and next Link in Threads with Topics Title.
Easily add Page Number on Message Index title.
Easily add Page Number on Topic title.
Customize Topic Title with some Pre-defined vars.
Posted Urls:
Redirect all external posted links to Protect Privacy and outgoing links
Optionally add page titles to external links to create keyword-rich links.
Blacklist for above option, in case that some websites may have issues with it.
NoFollow tag added to all posted URLs
Whitelist for above option, to excluse those websites from that tag.
Blacklist, as above, but those websites will always have that tag.
Meta Tags:
Dynamic Meta Keywords and Description in Topics, Message Index and Forum Index.
Set the maximun lenght of meta tags
Set a default meta description, when others aren't available.
Set a default meta keywords, when others aren't available.
Customize, with Pre-defined commands, Profiles Meta Description
Easily set copyright, audience, author, language and publisher tags
Optionally force Search Engines Spiders to ignore description from Yahoo's Directory and ODP Directory
Error Pages:
Optionally Prevent indexation of error pages
Set what to show in a 404 Error: Custom or a Pre-Created Page.
Server Errors(404, 403...) will be showned in Forum Layout
Acronym Parser:
Customized Acronyms, really useful to increase relevancy of content, replacing words like SMF with Simple Machines Forums.
Create unlimitied acronyms.
Optionally set if only whole words will be parsed.
Optionally ignore case when parsing acronyms.
URLs can be parsed too.
Social Bookmarks:
Allow Social Bookmarks per Post.
Allow Social Bookmarks per Topic.
Optionally integrate Facebook Like on Topics.
Enable/Disable each site (Twitter, Facebook, Digg.it, FUrl and others).
Share Topic box can be collapsed by each user and guest.

Share Post options are hidden by default to avoid unnecesary content in post.

Misc:
Set an specific theme exclusive for Guests and Robots in that way SEO themes will be available to Search Engines.
Edit .htaccess directly from Admin Panel.
Implementation of nofollow tag, noindex meta tag, and 404/403 headers in specific sites where they must be.
SEO Warning: Warnings about bad functionalities, broken links, and settings that aren't activated that could increase SEO on your website.