OpenVPN is an open source VPN daemon

Transmits AM radio on computers without radio transmitting hardware.

Capstone disassembly/disassembler framework: Core (Arm, Arm64, BPF, EVM, M68K, M680X, MOS65xx, Mips, PPC, RISCV, Sparc, SystemZ, TMS320C64x, Web Assembly, X86, X86_64, XCore) + bindings.

Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc, X86)

A free, powerful, multi-purpose tool that helps you monitor system resources, debug software and detect malware.

OSSEC is an Open Source Host-based Intrusion Detection System that performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response.

U2F USB token optimized for physical security, affordability, and style

CTF竞赛权威指南(Pwn篇)

Security oriented software fuzzer. Supports evolutionary, feedback-driven fuzzing based on code coverage (SW and HW based)

WiFi security auditing tools suite

Wazuh - The Open Source Security Platform

Suricata git repository maintained by the OISF

Solo: open security key supporting FIDO2 & U2F over USB + NFC

A fork of AFL for fuzzing Windows binaries

Open source smart card tools and middleware. PKCS#11/MiniDriver/Tokend

Interactive CTF Exploration Tool

Portable OpenSSH

JWT brute force cracker written in C

Easy to use cryptographic framework for data protection: secure messaging with forward secrecy and secure data storage. Has unified APIs across 14 platforms.

This book on heap exploitation is a guide to understanding the internals of glibc's heap and various attacks possible on the heap structure.

wolfSSL (formerly CyaSSL) is a small, fast, portable implementation of TLS/SSL for embedded devices to the cloud. wolfSSL supports up to TLS 1.3!

An ncurses-based Tox client (please make pull requests on the development fork: https://github.com/toktok/toxic)

Environment variables meet macOS Keychain and gnome-keyring <3

Make safest code in Android. (ndk实现AES,key在native中,防止被二次打包){长期维护,请star,勿fork}

µTox the lightest and fluffiest Tox client

OpenVPN GUI is a graphical frontend for OpenVPN running on Windows 7 / 8 / 10. It creates an icon in the notification area from which you can control OpenVPN to start/stop your VPN tunnels, view the log and do other useful things.

A fast, parallel test case minimization tool.