Detect It Easy - Detect It Easy - Simple software to analyze a file, determine its type and packer
YARA - Yara is a popular tool that finds its use in helping researchers to classify and detect malware.
ReFox - ReFox XI, FoxPro code protection, compression and recovery.
MultiExtractor - MultiExtractor - Extract picture (JPG, PNG, GIF, BMP, ICO.
.NET Reflector - .
Recaf - Recaf is a modern java bytecode editor using Objectweb's ASM and JavaFX.