PEiD is an intuitive application that relies on its user-friendly interface to detect packers, cryptors and compilers found in PE executable files – its detection rate is higher than that of other similar tools since the app packs more than 600 different signatures in PE files.

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IDA is the Interactive DisAssembler: the world’s smartest and most feature-full disassembler, which many software security specialists are familiar with.
Written entirely in C++, IDA runs on the three major operating systems: Microsoft Windows, Mac OS X, and Linux.
IDA is also the solid foundation on which our second product, the Hex-Rays decompiler, is built.
The unique Hex-Rays decompiler delivers on the promise of high level representation of binary executables. It can handle real world code. It is real.

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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. OllyDbg is a shareware, but you can download and use it for free. Special highlights are:

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