这个问题真的很尴尬，上官网： http://www.ollydbg.de/ 就可以发现
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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:
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好吧 做以下澄清
1.od1作者卖一份源码给immdbg，immdbg加如python支持
2.作者依然在继续开发od，并且od2已经更新多个版本，前后版本差别巨大，估计作者直接重新构架的。
3.od1不支持64位，但使用stealth64可以在64位系统中单步调试32位程序
以下是作者说明：
Anti Anti and compatibility plugin for Olly 1.10 running on Vista x64.
I made this little plugin to make unpacking on Vista x64 a bit more bearable ;)
It has most of the know anti-anti and makes an effort to make Olly behave like it should on regular x86 machines.
Next to this I implemented my own version of the OllyBone 'Break On Execute' making unpacking some simple packers a lot easier.
4.od是32位调试器
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
Of course, OllyDbg 2.0 will work on all existing versions of 32-bit Windows: 95, 98, ME, NT4, 2000 and XP. I don't know whether it will make sense to play with Server 2003 at all, and Longhorn is not yet ready.
最新OD2.0支持64位，或者安装streath64插件。在虚拟机上跑也行
