NSLogger
A modern, flexible logging tool
...It provides powerful additions like display filtering, defining log domain and level, image and binary logging, message coloring, traces buffering, timing information, link with source code, etc. Accept connections from local network clients (using Bonjour) or remote clients connecting directly over the internet. Online (application running and connected to NSLogger) and offline (saved logs) log viewing. Buffer all traces in memory or in a file, send them over to viewer when a connection is acquired. Define a log domain (app, view, model, controller, network…) and an importance level (error, warning, debug, noise…).