The Internet Archive is building a digital library. Search the history of over 866 billion web pages on the Internet. 28+ years of web history accessible through the Wayback Machine: https://archive.org/
Openverse - an extensive library of free stock photos, images, and audio, available for free use: https://openverse.org/
Volunteers from 102 countries have collected almost 4 million publications on economics and related science: http://repec.org/
American state search engine on 2200+ scientific sites. More than 200 million articles are indexed: https://www.science.gov/
One of the most powerful researches on academic studies texts. More than 100 million scientific documents, 70% of them are free: https://www.base-search.net/
Katalog over videnskabelige publikationer. Samling af peer reviewed case reports og undersøgelser, der nævner bivirkninger efter COVID-vaccination: https://react19.org/science
