CocoaNav is a tool that reads frameworks from the System/Library/Frameworks directory and displays the Cocoa class tree. It allows users to add their own frameworks and projects to view where their classes fit in. Selecting an ancestor will show their siblings, and clicking the arrow next to them will show their children.
Wineskin Winery creates Mac OS X ports/wrappers for Windows programs/games, with an easy-to-use GUI, integrated Wine, X11 and an installer.