Logging Framework for Mac OS X and iOS.
The lumberjack framework is fast & simple, yet powerful & flexible.
It is similar in concept to other popular logging frameworks such as log4j, yet is designed specifically for objective-c, and takes advantage of features such as multi-threading, grand central dispatch (if available), lockless atomic operations, and the dynamic nature of the objective-c runtime.
In most cases it is an order of magnitude faster than NSLog.
These details are provided for information only. No information here is legal advice and should not be used as such.