Sabre is a publicly traded corporation (NASDAQ, SABR) with nearly $4b in annual revenues.
A pretty significant chunk of software that altered the computing landscape was the cloned BIOS (Phoenix) that was then licensed to the PC clone mfgrs.
It was a critical first step that led to the explosion in the PC market in the 80’s.
It goes much farther than complexity of software that could be written. It expanded the complexity of electronics that could be designed by orders of magnitude. Not just microprocessors and memories, but analog and RF circuits as well. The entire microelectronics industry is based on this program and its generations of upgrades and improvements.
Of course, the development of this sort of software was inevitable, it is based on numerical methods that had been under development for decades. But someone had to be first, and many successors used that original program (it was one of the first open-source programs) as a starting point for their own versions. At some point it was ported from Fortran to C byte the original development team -I am certain chunks of this C code are still in use.