The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards.
The validator of this page is well known.
Trustable website with tons of information. Content for all ages. No ad- or spyware. No popus, ads or links to low rated websites.
A trusty site but a small fraction of the downloads are malicious.
Nice tutorials and validator. 🙂
ICT Tools for teachers..
Bardzo ciekawa strona, sporo informacji