Machonist is a static disassembler of PPC code for Mac OS X. This software is still at alpha stage.
There are many cases in which a disassembler comes in handy:
To examine foreign code you do not trust: Reveal and reverse engineer potential malware like viruses, worms, trojans and adware.
Using Machonist you do not even need to run the potentially hostile software in order to find out what it might do.
Protect your privacy and your data: take a deeper look at what some software actually does.
If you do not trust the security policy of your software vendor, you can find vulnerabilities and evaluate your personal risk. You could even fix those security flaws on your own.
Examine flaws and bottlenecks in your own software which might not be visible at higher-level language.
Educate yourself and learn the lower level of your daily work.
