Khan Academy Algorithms

Algorithm course ministered by Tomas Cormen and Devin Balkcom.

Real World Algorithms: A Beginner's Guide

An introduction to algorithms for readers with no background in advanced mathematics or computer science.

Levitin. Introduction to Algorithms

A very accessible illustration of algorithms in the forms of puzzles. No programming experience is required!

VisuAlgo

Visualising data structures and algorithms through animation.

See Algorithms

Visualizes algorithms and lets users create and share custom graphs and binary trees.

Recursive

Visualizes code execution step-by-step with a call tree, variable tracking, and line highlighting. Supports Python and JavaScript/TypeScript.

leetcode-py

Generates local LeetCode practice environments in Python, with Graphviz diagrams of trees, linked lists, and graphs in Jupyter and a parametrized pytest suite per problem.

CP-Algorithms

Algorithms and data structures are especially popular in the field of competitive programming.

Steven Halim. Competitive Programming book

HackerEarth

Accessible tutorials for beginners.

Code Chef

Accessible problems for beginners.

Codeforces

Challenging problems.

TopCoder

Sponsored by tech companies.

Leet Code

Interviews problems.

UVA

Archives previous ACM-ICPC Regionals and World Finals.

ProjectEuler

Math oriented problems.

An awesome list for competitive programming!

Awesome blog for all the resources and list of books and algorithms.

Algorithms Weekly

A good blog by Petr Mitrichev, mainly in Java.

Algorithm Tutorials by Tanuj Khattar

Excellent blog by Tanuj Khattar. Covers tutorials on some interesting data structures along with example problems to solve.

Introduction to Algorithms

Standard classic for anyone.

The Art of Computer Programming

Knuth's classic.

The Algorithm Design Manual

Easy to read and full of real-world examples.

MIT - 6-006

Well explained algorithms.

MIT - 6-046j

Similar to the previous one, but with different algorithms.

MIT - 6-00sc

An easy and well-explained introduction to algorithms.

Tim Roughgarden. Algorithms Illuminated

Tim Roughgarden, a pioneer of computer science, offers a companion to his book, with lecture videos and slides.

Performance Engineering of Software Systems. MIT OCW

A hands-on, project-based introduction to building scalable and high-performance software systems. Topics include performance analysis, algorithmic techniques for high performance, instruction-level optimizations, and caching optimizations.

Cloud and Distributed Computing: Algorithms and Systems by Misra & Patel

It teaches the internals of cloud computing and how concepts of distributed systems work inside clouds.

PostgreSQL Query Optimization: The Ultimate Guide to Building Efficient Queries

It introduces different classes of queries and optimization techniques suitable to each, such as the use of indexes and specific join algorithms.

Fabulous Adventures in Data Structures and Algorithms

It teaches lesser-known algorithmic approaches like immutable data structures—stacks, queues, deques, and unusual constructions like Hughes lists.

Tech Interview Cheat Sheet

Princeton DS Cheat Sheet

CLRS in short

Rice university DS course in short

Algo Deck

An open-source collection of +200 algorithmic cards.