- Leetcode: Coding Practice
- Leetcode Tools: Solutions, 2, 3 / Company Questions, 2, 3 / Animations / Anki Cards / Videos / Resources / Analytics
- NeetCode: Coding Interview Practice
- algonds: Coding Practice
- Codility: Coding Practice
- ProjectLearn: Coding Practice
- LintCode or CodeWars: Coding Practice
- Coding Questions or Skilled.dev: Coding Interview Questions
- BuildBox, DevPost, HackTheEarth, EMKC, AtCoder or Toph.co: Hackathon / Challenge Communities
- Rosetta Code, CodeAbbey, Kattis or Coding Problems: Coding Problems / Solutions
- Exercism, HackerRank or CS Circles: Programming Lessons
- Hello Algo: Data Structures and Algorithms Course
- Algorithms-Cheatsheet-Resources: Code Algorithm Cheat Sheets
- algorithms: Code Algorithms & Data Structures Tutorials
- JavaScript Algorithms: Algorithms and Data Structures in JavaScript
- VisuAlgo: Data Structures & Algorithm Animations
- Algorithm Visualizer, Staying or Sorting Algorithms Visuallizer / GitHub: Visualize Code Algorithms
- CSES Problemset: Collection of Algorithmic Programming Problems
- Memery Spy: Learn how Bytes Represent Variables