ECW JPEG2000 Codec SDK allows software developers to add support 
for the JPEG200 and ECW image formats into their own applications 
(commercial, internal, server based workflow, etc).

JPEG2000 is an International Organization of Standardization (ISO) 
image format.  ECW is an industry standard for handling large 
geospatial imagery. 

WWW: http://www.erdas.com/products/ERDASECWJPEG2000SDK/Details.aspx