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Is there a good FOSS utility for converting machine code to assembly or even C?

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http://unix.stackexchange.com – If I buy a piece of x86 32-bit or 64-bit software but I don't receive the source code, and I need to modify the software, I'll need to convert the machine code back into a high level language or at least assembly code. Is there a good utility to go from machine code to C? I assume that it would attempt to identify whether the program was compiled with a C compiler as opposed to C++ or Objective C or anything else. Thanks. (HowTos)

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Submitted by missing on 11/24/2012

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[SOLVED] Why Vala? 4 days 17 hours ago

Trilby wrote:Gcc compiles C into "plain old assembly", so why would you want to program in C?  Cut out the middle man, and write in assembly.Assembly is assembled into plain old binary machine code, so why would you want to program in assembly?Binary machine code is translated at runtime by the processor into high and low voltage states on a series of registers and output lines.&#16

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