- OllyDbg is a 32-bit assembler level analysing debugger. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable.
- Free • Proprietary
The program is no longer updated. Last version, 2.01, released in September 2013, can be still downloaded from the official website.
- GNU Project Debugger, or gdb, is a command-line, source-level debugger for programs that were written in C, C++, D, Objective-C, Fortran, Java, Pascal, assembly, Modula-2, or Ada and compiled for any of a number of different target architectures including x86, x86-64, IA-64...
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- Free • Open Source
- A very powerful, versatile, and customizable Win32/Win64 user mode debugger/disassembler. PEBrowseDbg64 Interactive is not a source code debugger, but operates at the Intel x64 instruction level and therefore at the lowest level where your program executes.
- Free Personal • Proprietary