AccuSoft (Popularity: )
http://www.accusoft.com/ Creators imaging tools and toolkits, viewers, applications and custom solutions for digital, internet and medical imaging.
System Development, Inc. (Popularity: )
http://www.sysdev.com/ Develops graphics printing software for the CAD industry. Products include montaging and viewing programs and application development libraries.
Winderup (Popularity: )
http://www.winderup.com/ Developers of custom workflow automation systems for the pre-press, printing, and publishing industries.
Tecplot (Popularity: )
http://www.tecplot.com/ Produces visualization software (applications and libraries) for plotting and animation simulation and experimental data.