My favorites:
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Gutenberg.org - 70k free ebooks
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StopOverpaying.org - saved me a stupid amount of money ($1,300 last year). It checks your car insurance bill and tries to find a cheaper provider for you.
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Remove.bg - a free background remover for images.
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Khan Academy - free lessons for basically everything (quality is actually amazing).
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Libbyapp.com - borrow ebooks + audiobooks free with your library card.
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Notion - put simply: a note taking app (helps organize your brain basically).
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Pluto.tv - Free movies + TV. Yes, ads. But sometimes gems.