OmniPage, originally created by Caere Corporation in the 80s, is one of the oldest and most widely used OCR engines. However, there has been a number corporate buy-outs and name changes in the nearly 40 years since its inception. You may know it as:
Caere (Before 2000)
ScanSoft (2000-2005)
Nuance (2005-2019)
Kofax (2019-Present)