Zeek is a powerful network analysis framework
OSS-Fuzz - continuous fuzzing for open source software
Qtum Core Wallet
SQL operating system instrumentation and monitoring framework
The Ray Tracing in One Weekend series of books
Generic binary protocol library that prevents injection attacks
Klotsky class block slider puzzles.
Turns UDP traffic into encrypted UDP/fakeTCP/ICMP traffic
Remote anti spam utility
A SOCKS5-over-TLS Proxy
A modern, AI-Smart, WASTE p2p for ipv4 and invisible address spaces
Mount EncFS folders - multiplatform style.
A Windows password cracker based on rainbow tables
[WARNING] Project has moved to http://github.com/Retroshare/Retroshare
password safe / manager for linux and windows (and mac ?) via qt
A full-featured, secure and lightweight offline password manager
Guncat acts like unix's cat, decrypting pgp encrypted sections
cron-like daemon able to use ssh connections
A program that detects and blocks phishing, pharming, Hacker's C&C.
ICAP Daemon that implements content scanning
Open Source Penetration Testing / Ethical Hacking Framework
Steghide GUI is perfect C++/Qt app for embedding and extracting data