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.
dirtyJOE - dirtyJOE - Java Overall Editor - homepage of binary java class file editor
MultiExtractor - MultiExtractor - Extract picture (JPG, PNG, GIF, BMP, ICO.
ExEinfo PE - Packer, compressor detector / unpack info / internal exe tools.
Recaf - Recaf is a modern java bytecode editor using Objectweb's ASM and JavaFX.