As it doesn't always have to be source code, today's tip is about a package manager on top of Xcode named Alcatraz.
A few weeks ago I installed the package manager as it seems to contain some nice packages, and indeed - it does come in handy. I've enabled the OMColorSense module, which shows a nice preview popup each time you create a
UIColor/NSColor in code to show a preview on how the color looks like.
Alcatraz contains some more nice packages, like a bunch of custom themes and templates, as well as small utilities to tweak Xcode's (sometimes odd) behaviour. Go check it out yourself, by installing the package manager from here.