Browseo.net is probably only one of the tools you're using to analyze and optimize websites. Here are some resources to help you along.
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These fellow Germans have been around for a long time. They developed an incredible brand with a product that is being widely used among European agencies. Check it out - there's a free version, too!
ContentKing is a relatively new tool that people have been giving positive feedback on. It features real-time auditing tools that allow you to track changes over time. This is extremely useful for ongoing SEO campaigns on bigger sites. Check it out!