OllyDbg

What it does

Analysis limit

The FAQ says OllyDbg cannot analyze only a selected piece of code because changes can affect analysis outside that selection.checked 8 Oct 2001

Breakpoints and tracing

It supports conditional, logging, memory, and hardware breakpoints, and can trace execution while logging arguments of known functions.checked 8 Oct 2001

Code analysis

It traces registers and recognizes procedures, loops, API calls, switches, tables, constants, and strings.checked 8 Oct 2001

Compatibility

The maker lists Microsoft Windows 95, 98, NT 4.0, 2000, or higher as system requirements; OllyDbg does not work under Win32s.checked 8 Oct 2001

Debugging

It can load and debug DLLs, attach to running programs, and debug multithreaded applications.checked 8 Oct 2001

Development status

The maker says development is frozen and describes the 64-bit version as incomplete.checked 8 Oct 2001

Patching

It saves patches between sessions, writes them back to executable files, and updates fixups.checked 8 Oct 2001

Plugins

Its open architecture supports third-party plugins, and the maker provides a Plugin Development Kit with documented sample plugins.checked 8 Oct 2001

Privacy

For original versions 1.00–1.10, the maker says OllyDbg does not act as a network client or server or send data to another computer, except for remote files specified by the user.checked 8 Oct 2001

Purpose

OllyDbg is a 32-bit assembler-level debugger for Microsoft Windows, intended for binary code analysis when source code is unavailable.checked 8 Oct 2001

Registration

The maker says registration is free, carries no financial or other obligations, and is requested for permanent or commercial use.checked 8 Oct 2001

Security caveat

The maker warns that it cannot guarantee archives or third-party modifications are free from viruses or Trojan horses.checked 8 Oct 2001

Support

The FAQ says the author usually answers email questions within 1–3 days.checked 8 Oct 2001