Pafish is a testing tool that uses different techniques to detect virtual machines and malware analysis environments in the same way that malware families do

Proxmark 3

FUSE driver to read/write Windows' BitLocker-ed volumes under Linux / Mac OSX

Filesystem monitor tool for Linux/Android iOS/macOS

Adiantum and HPolyC specification and test vectors

OWASP iGoat - A Learning Tool for iOS App Pentesting and Security by Swaroop Yermalkar

Yet another library library (and tools)

8Bit Nand universal reader for FTDI FT2323H Breakout Board, based on basic code from http://spritesmods.com/?art=ftdinand