Open source

• Taekwindow
• Win32WM, a module for VirtuaWin, but can also be used independently.
• Win-X-Move
• ComfortResize in ac'tivAid
• wmove
• KDE Mover-Sizer, an AutoHotkey script.
• AltWindowDrag, another AutoHotkey script.
• EasyWindowDrag, a third AutoHotkey script.
• NiftyWindows, a fourth AutoHotkey script.
• MoveInactiveWin, a fifth AutoHotkey script.

Freeware

• AquaSnap (Snap on move and resize)
• EasyMove
• Pitaschio (Snap on move and resize)
• allSnap (Window snapping)
• FreeShade (Rollups)
• WinMover (Note: This program didn't work for me and hung my Vista machine when I tried to run it)
• KatMouse (Scroll inactive windows)
• WizMouse (Scroll inactive windows)
• Mouse Hunter (Scroll inactive windows)
• Volumouse (Change volume with scroll wheel)

Related

• MouseImp
• DragLock
• True X-Mouse
• WinRoll
• Edgeless 2

Commercial

• Actual Multiple Monitors (Window snapping)
• ScreenSpace
• Zooom/2 for Mac

Other

• List of window management programs

Feel free to add more programs in the comments below.