The OllyDbg Debugger

The OllyDbg debugger is a machine level debugger created by Oleh Yuschuk for the 80x86. This machine-level debugger works with a variety of different assemblers including HLA, MASM, TASM, FASM, and NASM. Though OllyDbg is a shareware program, you may freely copy it (as long as you register it, to see the license, click here).

You may download OllyDbg directly from Webster (see the links below) or visit the OllyDbg support site and check for the latest and greatest version.

OllyDbg
Official Download Site
http://home.t-online.de/home/Ollydbg
Download OllyDbg
OllyDbg v1.08B (Stable Version)
OllyDbg v1.09d (Latest Version)
OllyDbg Plug-ins
OllyDbg command-line processor plug-in
OllyDbg disassembler source code
OllyDbg Documentation
Command Line Plugin notes
OllyDbg Disassembler Notes
Shareware Registration Form (It's free, but you must register to use)