Library of Congress has some helpful questions to ask when analyzing and engaging with Primary Source materials.
BBC (selection of podcasts related to Scientific Revolutions)
15 Minute History (Scramble for Africa)
Historical Association (Scramble for Africa)
Historical Association (British India)
Historical Association (collection related to Industrial Revolution)
BBC (Industrial Revolution)
The Guardian (Why is the scientific revolution still controversial?)
BBC (The Scientific Method)
Scientific Revolutions
(alternative keywords: Galileo, Copernicus, Francis Bacon, Enlightenment)
Stanford Encyclopedia of Philosophy
Professor Hatch from University of Florida
Fordham University (includes links to primary source letters)
BBC (various entries from multiple angles related to Scientific Revolutions)
Galileo (Stanford Encyclopedia entry)
Medium.com - 13 Important Thinkers from The Scientific Revolution (not highly authoritative but source of names)
Industrial Revolution
Yale-New Haven Teachers Institute (geared toward teachers but useful information)
HERB (CUNY-hosted database)
Scramble for Africa
New York Public Library (exhibit with images)
St. John's College - University of Cambridge (library exhibit)
BBC - Slavery and the 'Scramble for Africa'
France in West Africa (Great visual resource that is a jumping off point for more information)
Colonization of India
(alternative keywords: British Raj, British Colonialism, British Empire, British Imperialism, British India, Colonial India)
BBC - British Presence in India in the 18th Century
BBC - How the British reshaped India's caste system (opinion piece)
ThoughtCo. - The British Raj in India
New World Encyclopedia - British Raj
BBC - From Empire to Independence: The British Raj in India 1858-1947
British Library - India Office Collection
National Archives (British--specific example primary sources from British Empire in India here)
Gallica (French archive; has English translator but original documents in French)
Epact (electronic catalogue of medieval and renaissance scientific instruments from four European museums)
Project Gutenberg (Free Ebooks)
Digital Public Library of America (a lot of primary sources that are related to U.S. history)