Search engines on topics related to the general focus of Appropedia. More specific search engines should be placed on or linked from the particular topic page.

Note that not all content found with these search engines is open license - some is merely open access, and may be linked and quoted, but not copied extensively. Each search hit needs to be examined separately - for example, any non-classified work by a US federal government employee is public domain,[1] but if another person or body produces work for the US government, it is merely open-access.[verification needed] US state government works are usually not public domain.

See Custom searches for a number of searches on open content and relevant topics material. Other searches are given below.

General open license and open access searches[edit | edit source]

More specific[edit | edit source]