- Free • Proprietary
OllyDbg is a 32-bit assembler level analysing debugger. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable.
The program is no longer updated. Last version, 2.01, released in September 2013, can be still downloaded from the official website.
- Free • Open Source
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...No screenshots yet
- Free Personal • Proprietary
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.