1. OSX collector - for forensic analysis
2. MIDAS - Mac Intrusion Detection Analysis System
3. OSX auditor - for forensic analysis
4. Santa - binary whitelisting/blacklisting system
5. Masochist - framework for creating XNU based rootkits
6. Class-dump - command-line utility to dump Objective-C runtime information
7. Mach inject - Inter process code injection for Mac OS X
8. Task vaccine - similar to mach inject
9. Hopper - Hopper disassembler (not free)
10. Mach-O diff - mach-o diffing tool
11. Mac4n6 - A collection of OS X and iOS forensic artifacts
12. XGuardian scanner - Security Scanner for OSX

A collection of ios security related resources

1. IDB - iOS App Security Assessment Tool
2. iRET - iOS Reverse Engineering Toolkit
3. DVIA - Damn Vulnerable iOS App for learning
4. 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!