A work in progress list…
- Otx – Graphical frontend for otool, the disassembler. http://otx.osxninja.com/
- Burp Suite, Paros, Webscarab – web application assessment tools, including proxies (useful to sniff those online updates and registration schemes). http://research.corsaire.com/tools/
- HexFiend – Hex Editor. http://ridiculousfish.com/hexfiend/