PDF Drive
pdfdrive.com
A massive free search engine for PDF books and documents, covering everything from textbooks to novels.
Why it is useful
One of the largest free PDF search engines on the web, indexing millions of books and documents that are otherwise scattered across obscure corners of the internet.
More in Learning Resources
Other learning resources you might not have heard of.
- ProDesign ArchiveProDesign Archive is a one-time USD 10 download of 139 independently curated brand design references in structured Markdown. It helps designers and developers study color, typography, layouts and components, then bring clearer visual context into AI-assisted work.
- DuolingoThe most widely used language-learning app, using short gamified lessons, streaks, and spaced repetition to build vocabulary and grammar over time.
- Nature of CodeDaniel Shiffman's free online book and companion videos teaching creative coding through simulations of natural systems — physics, agents, neural networks, and evolution.
- CS UnpluggedTeaches core computer science concepts — algorithms, binary, sorting — through physical activities and games, with no computer required.
- Lingua.comFree language-learning resources including graded reading texts, listening and exercises for several languages, plus grammar and vocabulary help.
- VisuAlgoAnimated, step-by-step visualisations of data structures and algorithms, from sorting and linked lists to graphs and dynamic programming, with the ability to run each on your own input.