PEiD

PEiD detects most common packers, cryptors and compilers for PE files. It can currently detect more than 600 different signatures in PE files.

OllyDbg

OllyDbg is a 32-bit assembler level analysing debugger for Microsoft^® Windows^®. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable.

haXe

haXe (pronounced as hex) is an open source programming language.

While most other languages are bound to their own platform (Java to the JVM, C# to .Net, ActionScript to the Flash Player), haXe is a multiplatform language.