Juicy Studio: Colour Contrast Analyser
Uses the W3C algorithm to check for sufficient contrast between background and foreground colours.
http://www.juicystudio.com/services/colourcontrast.php

GrayBit Grayscale Contrast Tool
GrayBit Presents: GrayBit v2.0 Grayscale Conversion Contrast Accessibility Tool
http://graybit.com

Merck Pharmaceuticals in the UK
Market prescription and pharmacy medicines, contrast media and medical devices in the UK.
http://www.merck-pharmaceuticals.co.uk/

Reflection Contrast Microscopy
reflection contrast microscopy
http://members.lycos.nl/fprins/

Colour Contrast Analyser
Reveals the colour contrast of all elements in the DOM.
http://juicystudio.com/article/colour-contrast-analyser-firefox-extension.php

3D Nonlinear Inversion via Entropy of Image Contrast Minimization
A novel approach to nonlinear inversion of wave equation, 3D computed tomography, novel regularization forms
http://web.ift.uib.no/~antonych/3D.html

Azon Corporation
AZON manufactures specialty coated media--papers, films and other products for digital color imaging and reprographics.
http://www.azon.com/

Revo
REVO Sunglasses, engineered to see beyond. Premium sunglasses with contrast-enhancing lenses.
http://www.revo.com/

Upperton Ltd.
Upperton Limited. Providing a specialist contract spray drying and particle formulation service to the pharmaceutical, biotechnology and personal care industries.
http://www.upperton.com

Modeling of ultrasound contrast agents
Christian Cachard
http://creatis-www.insa-lyon.fr/menu/iultrasonore/demos/demo-contrast-agents-characterization/index-us.html