Browser for using Tor on Windows, Mac OS X or Linux
AdGuard browser extension
The Bitwarden browser extension vault
PHP/MySQL web application
The OWASP ZAP core project
The most advanced ad blocker for iOS
Proxy server to bypass Cloudflare protection
Remote isolated browser API for security
Decrypt passwords/cookies/history/bookmarks from the browser
The Ray Tracing in One Weekend series of books
Browser fingerprinting library
Privacy Badger automatically learns to block invisible trackers
Scanner detecting the use of JavaScript libraries
Probably the most modern and sophisticated insecure web application
Simple, free and efficient ad-blocker and privacy guard
GO Simple Tunnel, a simple tunnel written in golang
Fast, small, webkit based browser framework extensible by Lua
zx2c4 pass manager extension for Firefox, Chrome and Opera
Browser fingerprinting via favicon!
Privaxy is the next generation tracker and advertisement blocker
Cerbos is the open core, language-agnostic authorization solution
Cross-Platform Passwords & Secrets Vault
Open source secure password manager
The slightly more awesome standard unix password manager for teams
Web path scanner