This repository provides solutions to LeetCode problems for readers to review and use in coding practice.
The Best 90DaysOfCyberSecurity Alternatives in 2026
Looking for something like 90DaysOfCyberSecurity? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 16 are open source.
This repository documents a 90-day cybersecurity study plan with topics for a staged learning schedule.
Top picks at a glance
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Videos | — | Yes | — |
| 2 | Devops Exercises | — | Not stated | Linux |
| 3 | Python Guide | — | Not stated | — |
| 4 | Learn-Python | — | Yes | — |
| 5 | Tpoint Tech | — | Not stated | Android, Web |
| 6 | W3Schools | — | Not stated | Android, iOS, Web |
| 7 | Solutions | — | Yes | — |
| 8 | Frontend Challenges | — | Yes | — |
| 9 | Git Tips | — | Yes | — |
| 10 | GitHub Cheat Sheet | — | Yes | — |
All 90DaysOfCyberSecurity alternatives
Devops Exercises
github.com/bregman-arie/devops-exercisesA collection of DevOps interview questions covers tools and topics including Linux, cloud services, containers, networking, and databases.
Python Guide
github.com/realpython/python-guideThe Hitchhiker’s Guide to Python is a handbook covering Python installation, configuration, and development practices.
A Python learning playground and cheat sheet organizes example scripts by topic, with explanations for the code.
Tpoint Tech
tpointtech.comTpoint Tech publishes free online tutorials and interview questions across programming languages and technology subjects.
W3Schools
w3schools.comW3Schools provides online web tutorials, including material on HTML, CSS, and JavaScript.
A repository collects Python and modern C++ solutions to LeetCode problems.
A public list collects open-source frontend coding challenges from companies for testing development skills.
A collection of commonly used Git tips and tricks for reference while working with repositories.
GitHub Cheat Sheet lists useful features and capabilities of Git and GitHub.
Jupyter notebooks implement and derive machine learning algorithms from first principles using NumPy.
This tutorial walks through training and deploying a machine learning REST API that predicts cryptocurrency prices in ten steps.
A series of Jupyter notebooks teaches machine learning and deep learning in Python with Scikit-Learn, Keras, and TensorFlow.
GNOME developers can experiment with GNOME technologies and prototype GTK interfaces in the Workbench code playground.
Coding Problems provides solutions to coding and algorithm problems and multiple programming exercises.
Oh My Git!
ohmygit.orgA Git learning game visualizes repository structures in real time as players interact with the version control system.
A book explains the WebRTC real-time communication framework beyond its APIs.
Computer Science Lecture Links collects video lecture links for placement preparation, including C and data structures.
A curated list collects tutorials that teach programming through building projects.
This Korean and English educational web app visualizes and explains a name-generation model inspired by microgpt.
CSDIY
csdiy.wiki/enThis guide to self-learning computer science draws on the author’s experience studying at university.
HackTricks
book.hacktricks.wikiHackTricks collects cybersecurity reference material and provides links to training, tools, and updates.
This repository curates learning resources for software engineers, including material for people exploring programming topics.
Git Cheatsheet
ndpsoftware.com/git-cheatsheet.htmlThe interactive Git cheatsheet groups commands by the parts of a repository or workflow they affect.
Alternatives to similar tools
What is the best alternative to 90DaysOfCyberSecurity?
Are there open-source alternatives to 90DaysOfCyberSecurity?
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative






















