Inspiring Lists

SysOps/DevOps

Awesome Sysadmin - amazingly awesome open source sysadmin resources.
Awesome Shell - awesome command-line frameworks, toolkits, guides and gizmos.
Command-line-text-processing - finding text to search and replace, sorting to beautifying, and more.
Awesome Pcaptools - collection of tools developed by other researchers to process network traces.
awesome-ebpf - a curated list of awesome projects related to eBPF.
Linux Network Performance - where some of the network sysctl variables fit into the Linux/Kernel network flow.
Awesome Postgres - list of awesome PostgreSQL software, libraries, tools and resources.
quick-SQL-cheatsheet - a quick reminder of all SQL queries and examples on how to use them.
Awesome-Selfhosted - list of Free Software network services and web applications which can be hosted locally.
List of applications - huge list of apps sorted by category, as a reference for those looking for packages.
CS-Interview-Knowledge-Map - build the best interview map.
DevOps-Guide - DevOps Guide from basic to advanced with Interview Questions and Notes.
FreeBSD Journal - it is a great list of periodical magazines about FreeBSD and other important things.
devops-interview-questions - contains interview questions on various DevOps and SRE related topics.

Developers

Web Developer Roadmap - roadmaps, articles and resources to help you choose your path, learn and improve.
Front-End-Checklist - the perfect Front-End Checklist for modern websites and meticulous developers.
Front-End-Performance-Checklist - Front-End Performance Checklist that runs faster than the others.
Python's Magic Methods - what are magic methods? They're everything in object-oriented Python.
wtfpython - a collection of surprising Python snippets and lesser-known features.
js-dev-reads - a list of books and articles for the discerning web developer to read.
Commit messages guide - a guide to understand the importance of commit messages.

Security/Pentesting

Awesome Web Security - a curated list of Web Security materials and resources.
awesome-cyber-skills - a curated list of hacking environments where you can train your cyber skills.
awesome-devsecops - an authoritative list of awesome devsecops tools.
awesome-osint - is a curated list of amazingly awesome OSINT.
HolyTips - tips and tutorials on Bug Bounty Hunting and Web App Security.
awesome-threat-intelligence - a curated list of Awesome Threat Intelligence resources.
Red-Teaming-Toolkit - a collection of open source and commercial tools that aid in red team operations.
awesome-burp-extensions - a curated list of amazingly awesome Burp Extensions.
Free Security eBooks - list of a Free Security and Hacking eBooks.
Hacking-Security-Ebooks - top 100 Hacking & Security E-Books.
privacy-respecting - curated list of privacy respecting services and software.
reverse-engineering - list of awesome reverse engineering resources.
linux-re-101 - a collection of resources for linux reverse engineering.
reverseengineering-reading-list - a list of Reverse Engineering articles, books, and papers.
Awesome-WAF - a curated list of awesome web-app firewall (WAF) stuff.
awesome-shodan-queries - interesting, funny, and depressing search queries to plug into shodan.io.
RobotsDisallowed - a curated list of the most common and most interesting robots.txt disallowed directories.
HackingNeuralNetworks - is a small course on exploiting and defending neural networks.
wildcard-certificates - why you probably shouldn't use a wildcard certificate.
Don't use VPN services - which is what every third-party "VPN provider" does.
awesome-yara - a curated list of awesome YARA rules, tools, and people.
macOS-Security-and-Privacy-Guide - guide to securing and improving privacy on macOS.
macos_security - macOS Security Compliance Project.
awesome-sec-talks - is a collected list of awesome security talks.
Movies for Hackers - list of movies every hacker & cyberpunk must watch.
Cryptography_1 - materials used whilst taking Prof. Dan Boneh Stanford Crypto course.
Crypton - library to learn and practice Offensive and Defensive Cryptography.

Other

Cheatography - over 3,000 free cheat sheets, revision aids and quick references.
awesome-static-analysis - static analysis tools for all programming languages.
computer-science - path to a free self-taught education in Computer Science.
post-mortems - is a collection of postmortems (config errors, hardware failures, and more).
build-your-own-x - build your own (insert technology here).
Project-Based-Tutorials-in-C - is a curated list of project-based tutorials in C.
The-Documentation-Compendium - various README templates & tips on writing high-quality documentation.
awesome-python-applications - free software that works great, and also happens to be open-source Python.
awesome-public-datasets - a topic-centric list of HQ open datasets.
machine-learning-algorithms - a curated list of all machine learning algorithms and concepts.