๐ 200+ Ultimate Open-Source Repositories: The Developerโs Curated Guide [2026] โ ๐ (Curated by Category)

The ultimate curated collection of 200+ high-impact open-source repositories for Web Dev, DevOps, AI, and Security. Updated for 2026.
A curated, categorized, and regularly updated list of must-see open source repositories for developers, students, and tech enthusiasts.
| **๐ Established in 2024 |
Continuously Maintained** |
๐ Table of Contents
๐ Roadmaps & Learning Paths
๐ค AI & LLM Engineering (The โNewโ Essential)
This is currently the most starred category on GitHub.
- Ollama โ Run large language models (Llama 3.2, Mistral) locally.
- LangChain โ The standard framework for building LLM-powered applications.
- Hugging Face Transformers โ State-of-the-art machine learning for Pytorch, TensorFlow, and JAX.
- Claude Code โ Agentic coding tool that lives in your terminal and understands your entire codebase.
- Browser-use โ Open-source AI for web automation (letting AI โuseโ the browser).
- Aider โ AI pair programming in your terminal.
๐ Web Development
- shadcn/ui โ Beautifully designed components built with Radix UI and Tailwind CSS.
- Lucide โ Beautiful & consistent icons, a community fork of Feather Icons.
- T3 Stack โ The best way to start a full-stack, typesafe Next.js app.
- Directus โ The modern data platform that turns any SQL database into an API and Admin UI.
- freeCodeCamp โ Learn to code for free.
- 30-seconds-of-code โ Short JavaScript code snippets.
- javascript-algorithms โ Algorithms and data structures in JS.
- react โ The library for web and native user interfaces.
- vue โ The progressive JavaScript framework.
- angular โ One framework, mobile & desktop.
- next.js โ The React framework for production.
- nuxt โ The Intuitive Vue Framework.
- awesome-react โ Curated list of React resources.
- awesome-vue โ Curated resources for Vue.js devs.
- nodebestpractices โ Node.js best practices.
- storybook โ UI component explorer for frontend devs.
- css-protips โ Tips to improve your CSS skills.
- awesome-tailwindcss โ Resources for Tailwind CSS.
- md8-habibullah/jsdelivr โ A free CDN for open source, npm, GitHub, and more.
๐ฑ Mobile Development
๐จโ๐ป Programming Languages & Algorithms
๐งช Data Science & Machine Learning
โ๏ธ Advanced DevOps & Cloud Native Infrastructure โ๏ธ
- free-for-dev โ List of free services for developers.
- devops-exercises โ DevOps and SRE interview questions and exercises.
- kubernetes โ Production-Grade Container Scheduling and Management.
- docker โ Docker Community Edition.
- awesome-devops โ Curated DevOps resources.
- ansible โ Ansible is a radically simple IT automation platform.
- terraform โ Infrastructure as Code.
- awesome-docker โ A curated list of Docker resources.
- prometheus โ Monitoring system & time series database.
- awesome-kubernetes โ Kubernetes curated resources.
- awesome-ciandcd โ CI/CD resources and tools.
- awesome-terraform โ Curated list for Terraform.
- md8-habibullah/ansible โ Ansible playbooks, guides, and resources.
- Coolify โ An open-source, self-hosted alternative to Heroku/Netlify/Vercel.
- Argo CD โ Declarative, GitOps continuous delivery tool for Kubernetes.
- LocalStack โ A fully functional local AWS cloud stack.
- Grafana โ The open observability platform for analytics and monitoring.
- Pulumi โ Infrastructure as Code using real programming languages (TS, Python, Go).
๐ก๏ธ Cybersecurity & Pentesting (Your Specialty)
As a Security Engineer, these tools are for authorized penetration testing, research, and infrastructure hardening only.
- OWASP Top 10 โ The standard awareness document for developers and web application security.
- Gitleaks โ Scan git repos for secrets like passwords, API keys, and tokens.
- SQLMap โ Automatic SQL injection and database takeover tool.
- Sherlock โ Hunt down social media accounts by username across social networks.
- PayloadsAllTheThings โ A list of useful payloads and bypasses for Web Application Security.
๐ฎ Command & Control (C2) & Remote Access
- Sliver โ A powerful, cross-platform, open-source C2 framework (the best open-source alternative to Cobalt Strike).
- Evil-WinRM โ The ultimate shell for hacking Windows; features lateral movement, file transfer, and memory execution.
- NetExec โ The successor to CrackMapExec; a multi-tool for automated network assessment and credential harvesting.
- Havoc โ A modern, malleable post-exploitation command and control framework.
๐ค Botnets, Agents & AI Red Teaming
- DeepTeam โ LLM Red Teaming framework to simulate jailbreaks and prompt injections on AI agents.
- Mirai (Research) โ The infamous IoT botnet source code (for research and defense signature building).
- Cai-Framework โ Cybersecurity AI framework for building autonomous agents that discover and exploit vulnerabilities.
- Honeymap โ Real-time visualization of world-wide honeypot attacks (see the โbotnetโ in action).
๐ก Network Monitoring & Hidden Recon
- Bettercap โ The โSwiss Army Knifeโ for 802.11, BLE, and Ethernet reconnaissance and MITM attacks.
- RustScan โ A modern port scanner that can scan 65k ports in 3 seconds; designed for speed and scriptability.
- Zabbix โ Enterprise-grade monitoring that can track thousands of devices as a distributed โmonitoring net.โ
- Netdata โ Per-second, real-time health and performance monitoring for entire distributed clusters.
๐ต๏ธ Advanced OSINT & Data Leaks
- SpiderFoot โ Automates OSINT collection from over 100 public data sources for threat intelligence.
- Gitleaks โ Scan every commit in your history to find leaked API keys, tokens, and secrets.
- Mary-SUE โ (Your Tool/Reference) โ Specialized script for harvesting username-linked data across platforms.
- Ciphey โ Fully automated decryption tool that uses AI and Natural Language Processing to crack unknown encryptions.
๐ฃ Exploitation & Payload Heavies
- Metasploit Framework โ The worldโs most used penetration testing software.
- PayloadsAllTheThings โ A massive library of payloads for every web vulnerability imaginable.
- Impacket โ A collection of Python classes for working with network protocols (SMB, MSRPC) โ essential for Windows network hacking.
- Aircrack-ng โ The standard for auditing wireless networks and cracking WPA/WPA2.
๐๏ธ System Design & Architecture
๐ Awesome Lists & Resources
- gitignore โ Useful .gitignore templates.
- ohmyzsh โ A delightful community-driven framework for managing your zsh configuration.
- powerlevel10k โ Super flexible and fast zsh theme.
- prettier โ Code formatter.
- eslint โ Pluggable JavaScript linter.
- homebrew โ The missing package manager for macOS (or Linux).
- nvm โ Node version manager.
- fzf โ A command-line fuzzy finder.
- tmux โ Terminal multiplexer.
- ripgrep โ Fast command-line search tool.
- shields โ Quality metadata badges for open source projects.
๐ GitHub Profile & Achievement Showcases
๐จ Themes & Customizations
๐จ Design, Frontend & UX
๐ Visualization, Data & Charts
- awesome-visualization โ Curated list of visualization libraries.
- d3 โ Bring data to life with SVG, Canvas and HTML.
- chart.js โ Simple yet flexible JavaScript charting.
- awesome-dataviz โ Curated list of data visualization libraries.
- echarts โ Powerful visualization library for browser.
๐ผ Job Search & Career
๐๏ธ Miscellaneous / General
- Rocket.Chat โ The leading open source team chat platform, Slack alternative, with rich integrations and self-hosting.
- Mattermost โ Secure, self-hosted Slack alternative for teams and enterprises.
- Matrix (Synapse) โ Matrix protocol reference server, a decentralized, federated, end-to-end encrypted messaging network.
- Element โ The flagship Matrix client, formerly Riot, web and desktop app.
- Telegram (Unofficial, open clients) โ Unofficial open source desktop client for Telegram.
- Wire โ Secure, cross-platform team collaboration platform.
- Zulip โ Powerful threaded open source group chat, great for remote teams.
- Rocket.Chat.ReactNative โ Mobile client for Rocket.Chat.
- Jitsi Meet โ Secure, scalable open source video chat and conferencing platform.
- SimpleX Chat โ Private, decentralized, and serverless messenger.
- Conduit โ Lightweight Matrix homeserver written in Rust.
- Openfire โ Real-time collaboration server based on XMPP protocol.
- SOGo โ Groupware server with calendar, contacts, and chat.
- Open Source WhatsApp Clients โ Unofficial WhatsApp Web API for Node.js.
A curated list of repositories to master the Linux ecosystem, from core fundamentals to high-performance modern replacements.
๐ Mastering the Fundamentals
- eza-community/eza โ A modern, maintained replacement for
ls with colors and git integration.
- sharkdp/bat โ A
cat clone with syntax highlighting, line numbers, and git integration.
- ajeetdsouza/zoxide โ A smarter
cd command that learns your habits to help you navigate instantly.
- BurntSushi/ripgrep โ The fastest text search tool (
grep alternative) that respects your .gitignore.
- sharkdp/fd โ A simple, fast, and user-friendly alternative to the
find command.
- aristocratos/btop โ An immersive, high-performance system monitor (the successor to
htop).
- mfontanini/duf โ A better
df utility with clear, colorful graphs for disk usage.
- dalance/procs โ A modern replacement for
ps written in Rust with colored output.
๐ Shell Customization & Terminal Experience
- alacritty/alacritty โ A cross-platform, GPU-accelerated terminal emulator focused on speed.
- kovidgoyal/kitty โ A modern, feature-rich, GPU-based terminal supporting images and ligatures.
- wez/wezterm โ A powerful GPU-accelerated terminal emulator and multiplexer written in Rust.
๐ง Shell Frameworks & Prompt Enhancements
๐ Want More? Explore Further!
๐ค Contributing
Want to make this list even better? See CONTRIBUTING.md and open a pull request!
- Suggest new repos
- Fix errors or descriptions
- Add new categories
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Maintained by md8-habibullah