Kapeli (http://kapeli.com/dashexpander/) has released Dash and DashExpander, two free Mac applications. Both require Mac OS X 10.7 (“Lion”) and are available at the Mac App Store.
DashExpander saves you from typing long strings of text by defining abbreviations that are later expanded whenever you type them. You can collect text snippets that you often reuse.
Dash is a code snippet manager and documentation browser. It builds on top of DashExpander and provides extra functionality for developers. Dash also features Wiki pages for each Cocoa class and method.