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Inclusion on the list doesn't automatically mean the absolute truth is on these websites, so always be critical and compare information between different sources. The content of the subsections is alphabetically organized. Please add free online sources if you know some that are missing in this list, but try to keep it relevant and trustworthy.
Combines Google Maps with a wiki system for polygonally defined areas; currently supports 35 languages 13,300,000: CC BY-NC-SA [67] Wikimedia Commons: Misc – Electronic media: Repository of free electronic media; a Wikimedia project: 113,653,542 files CC BY-SA and some other free licenses Wikinews: General – News
Wikipedia is a free multilingual open-source wiki-based online encyclopedia edited and maintained by a community of volunteer editors, started on 15 January 2001 as an English-language encyclopedia. Non-English editions were soon created: the German and Catalan editions were created on circa 16 March, [ 1 ] the French edition was created on 23 ...
Free Proteopedia: English Wiki-based 3D encyclopedia of proteins and other molecules. Free RP Photonics Encyclopedia: English Laser technology, photonics, and various other areas of photonics such as nonlinear optics, non-laser light sources, fiber optics, and ultrashort pulses of light. Free ScienceWorld: English
This is a list of lists of websites, sorted by type and subject, including comparisons and other lists of lists. By type. Academic databases and search engines;
There are Wikipedia articles, lists, and categories which provide information on other websites: Comparison of wiki farms – non-comprehensive because of Wikipedia's notability policies. A more comprehensive comparison of wiki farms can be found at mw:Hosting services. List of wikis; Category:Wikis; Category:Wiki communities
This is a starting point for collating free, web-based resources available to editors, as well as indexes to help point to sources. Please feel free to add new resources with a URL to the site, and a brief description. Don't worry too much about presentation or organization, this is just a draft. Add new headings as needed.
Now items concerning websites which are available free of charge but are not free content need to be moved to other categories. Subcategories This category has the following 5 subcategories, out of 5 total.