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.
VB Decompiler - VB Decompiler Perfect source code recovery solution for Visual Basic 5.0/6.0 applications and fast disassembler for Visual Studio .NET compiled apps
MultiExtractor - MultiExtractor - Extract picture (JPG, PNG, GIF, BMP, ICO.
.NET Reflector - .
ExEinfo PE - Packer, compressor detector / unpack info / internal exe tools.