The development is frozen. Sorry.
For those who still want to try
the incomplete 64-bit version: odbg64.zip
Progress in OllyDbg 64 (05-Feb-2014)
VERSION 2.01  (27-Sep-2013)
+ Disassembler v2.01, preliminary version (GPL v3)

 Off-topic 1: PaperBack - backups on the paper (v1.10 22-Jul-2013)
Off-topic 2: Jason - graphical interface to the Hercules S/370 emulator
Softpedia Clean Award

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!