- LLEK Bookmarks Scientific Search Engines - Physics
- A comprehensive catalog of scientific resources and media worldwide but especially in German and English.
- Martindale's Physics Center
- Directory of useful and/or important sites related to the full range of physics topics.
- Learn it all, from smallest particles to the nature of the universe. Experts or newbies can test and increase physics knowledge. From About.com.
- The Net Advance of Physics: Annotated Physics Encyclopædia
- A directory of different websites with annotations giving information on the level and contents of the sites.