Deobfuscation

de4dot – .NET deobfuscator and unpacker.

FLOSS – The FireEye Labs Obfuscated String Solver uses advanced static analysis techniques to automatically deobfuscate strings from malware binaries.

XORBruteForcer – A Python script for brute forcing single-byte XOR keys.

CyberChef – The Cyber Swiss Army Knife.

JSUnpack – JavaScript deobfuscator.