On-Screen Ruler - lightweight, free, semi-transparent ruler
Dimension Data - A global systems integrator and managed services provider for hybrid IT.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
Cargoscan Pallet and Parcel Dimensioners - Cargoscan is a dimensioning systems that can helps to operate more efficiently and profitably as space is a scarce resource in both the transport and warehousing business.
Meazure - What are the dimensions of that image? How big is this window?
CubeTape - Mobile dimensioner Cubetape is a portable volumetric weight calculator. Dimensional volumetric weight for all freight types. Integrates with existing applications.