What are the best features the online SEO tools like WebCEO, SEOmoz, Raven SEO, and Hubspot have?

What are the best features the online SEO tools like WebCEO, SEOmoz, Raven SEO, and Hubspot have?

SEO Tools

It's been great seeing the maturity of the SEOmoz toolset, particularly the launch of Open Site Explorer for our research. They also have a very active community which is very valuable for ongoing training, support and general resources. 

The SEObook community is also very active but has quite a different vibe, feels a little more underground and raw which I like a lot...also very useful training tools and Aaron Wall seems on the ball, smart and very involved.

For us, Raven has provided the most useful tools, especially for reporting and ongoing management of projects. They pull in very useful data, including Google Analytics, monitoring and bundle them into a nice little package for clients that used to take us a lot longer to produce. Their research options are not quite as solid as SEOmoz but there is some crossover, we're certainly not going to rely on the "Design Analyzer" or "Quality Analyzer" to provide very useful info, as much as they are based on best practices.