IDA Pro
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- Website: http://www.datarescue.com/idabase/index.htm
- Demo version: http://www.datarescue.be/idademo/
- Freeware version: http://www.datarescue.be/idafreeware/freeida43.exe
IDA Pro is a disassembler and debugger with a lot of features that is very useful for reverse engineering.
It is proprietary software that runs on Windows and Linux; there is a zero-cost evaluation version.
Boosting the freeware version
The freeware version of IDA Pro is an invaluable tool. One important function is the ability to produce different flow graphs from the disassembly. Sometimes these graphs can be quite messy and needs to be processed. The version of wingraph32.exe that is included with the freeware version of IDA Pro can't save the generated graphs. Just replace it with a version from a demo version of IDA Pro and the save option will be availible. Saved graphs will have a .gdl suffix.