MathNet lets users browse and search more than 30,000 Olympiad-level problems from 47 countries in 17 languages.
The Best TheAlgorithms Alternatives in 2026
Looking for something like TheAlgorithms? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 4 are free or have a free plan and 2 are open source.
Learn data structures and algorithms through open-source implementations in multiple programming languages.
Top picks at a glance
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | MathNet | Free | Not stated | Web |
| 2 | MSD Manuals | — | Not stated | Web |
| 3 | DermNet® | — | Not stated | Web |
| 4 | AoPS Alcumus | Free | Not stated | Web |
| 5 | SpeedSheet | — | Not stated | Web |
| 6 | Practical Deep Learning | — | Not stated | Web |
| 7 | Passmedicine | Free | Not stated | Web |
| 8 | Data Science Course By IBM | — | Not stated | Web |
| 9 | UC San Diego CG | — | Not stated | Web |
| 10 | CFDTool | — | Not stated | Web |
All TheAlgorithms alternatives
MSD Manuals
msdmanuals.comMSD Manuals provide medical reference material in multiple versions for different audiences.
DermNet®
dermnetnz.orgDermNet provides dermatology topics, images, cases, and a skin checker for learning about skin conditions.
The AoPS Alcumus system provides free online mathematics learning materials from Art of Problem Solving.
SpeedSheet
speedsheet.ioFind programming commands and syntax quickly with SpeedSheet, a set of interactive cheat sheets.
Practical Deep Learning
course.fast.aiPractical Deep Learning for Coders is a free course on applying deep learning and machine learning, designed for people with coding experience.
Passmedicine offers online revision for the 2026 UCAT, with resources for exam preparation.
Data Science Course By IBM
skillsbuild.org/students/course-catalog/data-s…IBM SkillsBuild provides free AI and technology teaching resources, including lesson plans, educator training, and toolkits.
UC San Diego CG
meded.ucsd.edu/clinicalmed/introduction.htmlThe UC San Diego Practical Guide to Clinical Medicine presents a guide to clinical medicine.
CFDTool
cfdtool.comCFDTool provides a computational fluid dynamics toolbox for running simulations.
Wayne's Word
waynesword.netA natural history newsletter archive covers plants, trivia, and biology through its indexed pages.
The Engineering Toolbox
engineeringtoolbox.comThe Engineering Toolbox offers tools and information for engineering and design.
ChemOCR
github.com/kunal1320k/ChemOCRChemOCR uses a lightweight model to recognize chemical structures from images and convert them into other formats.
Wiki
wiki.openrocket.infoThe OpenRocket wiki provides collaboratively written documentation for the open-source model rocket simulator.
Follow a 100-day sequence of machine-learning coding exercises in this repository.
The community-maintained Manim Python library supports the creation of mathematical animations.
Fine Tuning Guide
docs.unsloth.ai/get-started/fine-tuning-guideThis Unsloth guide introduces the basics and best practices of fine-tuning language models.
Wumbo
wumbo.netVisitors can use Wumbo as a math reference site for students, teachers, and enthusiasts.
OpenDroneMap
opendronemap.orgOpenDroneMap processes drone imagery to generate maps, point clouds, and 3D models.
Introduction to machine learning with scikit-learn
github.com/justmarkham/scikit-learn-videosThis repository contains Jupyter notebooks for an introductory video series on machine learning with scikit-learn.
RocketPy
docs.rocketpy.orgRocketPy provides software and information for rocket flight simulation.
Benchmarks Game
benchmarksgame-team.pages.debian.net/benchmark…Compare measured performance across programming language implementations in the Benchmarks Game.
awesome-html5
diegocard.com/awesome-html5Browse a curated collection of HTML5 resources, including articles, standards, and multimedia topics.
The Hugging Face Diffusion Models Course provides course materials for studying diffusion theory and image generation.
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