Instead of providing a long list of relevant websites in engineering, it is more important to know how to critically evaluate what you find on the web.
Ask yourself these questions:
- Who wrote this? Can you verify their credentials? Do they work for a company, government agency or a research organizations (look at the website – is it .com, .gov, .edu, .net or .org)
- Is there contact information for the author or organization they represent?
- Do they authors identify where they obtained the data? This is critical for technical information. It is usually preferable to use verifiable data from standard handbooks etc. rather than finding random information on the web
- Is it current information? (may not matter in the case of standard technical data). Does the website have a “last updated” date?
- Is the information biased? It may be if it is from a political organization that has an agenda
Having said that, the following meta-websites provide good critically evaluated starting points for your exploration of the Internet:
Best of the Web: Technology
The WWW Virtual Library Engineering
No longer maintained but still has some good information