AWare Systems on-line
Tip: Especially note TechNote2, since it invalidates part of the TIFF specification. Failure to do so will result in incompatibility with virtually all other JPEG-in-TIFF software, whether they comply with TechNote2, or try to comply with the original ambiguous specification. If you use a third-party library, check whether this library complies with TechNote2, since many libraries don't.
Friends and neighbours
SimDesign is a company that specializes in imaging software just like AWare Systems. Nils Haeck is a very good programmer, and knowledgable mathematician. Check out his DtpDocuments package!
GDAL is an excellent translator library for raster geospatial data formats.