CLutils
CLutils is a collection of functions mostly tailored for Mac OS X and iPhone development, with some cross-platform exceptions. Here's a quick breakdown.
cl_debug (cross platform)
Light-weight macro library for printf debugging (see cubelogic.org/cl_debug)
CLcutils (cross platform)
C and C++ utilities typically requiring clib or STL.
CLChessUtils (cross platform)
C utilities for chess applications
CLCarbon (Mac OS X)
C utilities with Carbon dependencies
CLCocoa (Mac OS X)
Objective-C utilities, with some C wrappers
CLFoundation (Mac OS X and iOS)
Objective-C routines, with dependencies on Foundation only.
CLIPhone (iOS)
Objective-C routines with UIKit dependencies.
License
CLutils is licensed under the revised BSD license.
Source code
See CLutils project on GitHubSupport
Feel free to send bug reports (and suggestions).