Programming Languages
Language books from Bash and C through Swift, TypeScript, and Rust.
Egtry Books
424 free textbooks across 14 tracks, with static KaTeX math, browser-friendly pages, and diagrams computed from traced data.
Tracks
Pick a subject to see the books, lessons, and diagrams available for that track.
Data Structures and Algorithms
Core structures, algorithms, graph traversals, and replayed execution steps.
Web
HTML, CSS, SVG, Canvas, WebGL, and browser-side data handling.
Python Data Analysis
Data preparation, grouping, visualization, and analysis workflows.
Mathematics
Arithmetic through calculus, linear algebra, statistics, and geometry.
Applied Math
Computing, graphics, signals, control, optimization, and numerical methods.
Physics
Classical mechanics, energy, waves, circuits, relativity, and quantum topics.
Biology
Molecular biology, genetics, population models, and bioinformatics diagrams.
Finance
Pricing, risk, portfolio ideas, and market mechanics with traceable calculations.
Law
Rule models and procedural flows expressed as classroom-friendly diagrams.
Databases
Query plans, isolation, storage, indexing, and transaction behavior.
Operations Research / Optimization
Flow, assignment, scheduling, dynamic programming, and search methods.
Networks & Encryption
Packets, protocols, routing, keys, and encryption steps you can check.
Machine Learning
Model training, gradients, trees, clustering, and evaluation by traced data.
Books
Read 424 books across 14 tracks. The catalog keeps every free textbook grouped by subject.