Nadar

Nadar was an ancient Linux-like company.

Rumored time when Nadar was founded.
It is not known exactly when Nadar was founded. In 2509, a time traveler named Mike Conan leaked the possible year when it was founded. He claimed that Nadar was founded by an unknown man [possibly, one of FAR (First Ancestral Race) or the proto-humans] in RSOTUAE (Real Start of the Universe and Everything). If this was confirmed, then Nadar would be the first computer company ever existed.

Longevity
It's no surprise that Nadar has an absurdly long time of operation. It ran from possibly RSOTUAE to 500 AD, when it was supplanted by Haco Co.