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

    Intuitive user interface, no cryptical commands
    Code analysis - traces registers, recognizes procedures, loops, API calls, switches, tables, constants and strings
    Directly loads and debugs DLLs
    Object file scanning - locates routines from object files and libraries
    Allows for user-defined labels, comments and function descriptions
    Understands debugging information in Borland® format
    Saves patches between sessions, writes them back to executable file and updates fixups
    Open architecture - many third-party plugins are available
    No installation - no trash in registry or system directories

    Debugs multithread applications
    Attaches to running programs
    Configurable disassembler, supports both MASM and IDEAL formats
    MMX, 3DNow! and SSE data types and instructions, including Athlon extensions
    Full UNICODE support
    Dynamically recognizes ASCII and UNICODE strings - also in Delphi format!
    Recognizes complex code constructs, like call to jump to procedure
    Decodes calls to more than 1900 standard API and 400 C functions
    Gives context-sensitive help on API functions from external help file
    Sets conditional, logging, memory and hardware breakpoints
    Traces program execution, logs arguments of known functions
    Shows fixups
    Dynamically traces stack frames
    Searches for imprecise commands and masked binary sequences
    Searches whole allocated memory
    Finds references to constant or address range
    Examines and modifies memory, sets breakpoints and pauses program on-the-fly
    Assembles commands into the shortest binary form
    Starts from the floppy disk

and much, much more!

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