Resizing/moving windows with keypress and mouse in Mac OS X

A few years ago I remember a friend using an application in Ubuntu that made window management extremely easy. If you wanted to move the active window, you would press a key and drag the window by clicking anywhere on the window. If you wanted to resize the active window (proportionally), you would press a key and turn the wheel. I think this is very intuitive way to resize and move a window.

Are there any free applications for Mac OS X that can utilize similar mechanics?

Afloat does moving and resizing as explained, and does more than that. I really loved this application.

Free:

• BetterTouchTool
  • Primarily used for mapping actions to gestures
• Afloat
  • SIMBL plugin

Commercial:

• Zooom2
  • Allows using fn as a modifier
  • Snap to screen edges and other elements
• MondoMouse
• Flexiglass
  • Also other window management features, like split screen shortcuts
• BetterSnapTool
• NuKit
• HyperDock
  • Also Aero snap like functionality