Links on tools are available on the following topics:
- There is an almost endless number of web site validators out there. A list of HTML validator provided by Art Of Blog.
- The best German help and reference for HTML and CSS is SELFHTML.
- CSS 4 you is a very comprehensive reference for CSS syntax.
- At the site WebmasterCoffee websites can be analyzed reveling information like the webserve used, the website generator, ...
- Seitwert analyzes websites regarding their visibility for search engines.
- The Link Checker at SEO PRO helps you find out from which websites links are pointing to your site.