- OSX collector - for forensic analysis
- MIDAS - Mac Intrusion Detection Analysis System
- OSX auditor - for forensic analysis
- Santa - binary whitelisting/blacklisting system
- Masochist - framework for creating XNU based rootkits
- Class-dump - command-line utility to dump Objective-C runtime information
- Mach inject - Inter process code injection for Mac OS X
- Task vaccine - similar to mach inject
- Hopper - Hopper disassembler (not free)
- Mach-O diff - mach-o diffing tool
- Mac4n6 - A collection of OS X and iOS forensic artifacts
- XGuardian scanner - Security Scanner for OSX
A collection of ios security related resources
- IDB - iOS App Security Assessment Tool
- iRET - iOS Reverse Engineering Toolkit
- DVIA - Damn Vulnerable iOS App for learning
- LibiMobileDevice - A cross-platform protocol library to communicate with iOS devices
Other amazingly awesome lists can be found in the awesome-awesomeness list.
Your contributions are always welcome!