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Lotus 1-2-3 For Linux
(lock.cmpxchg8b.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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That'd be VisiCalc from all the way back in 1979. The slam-dunk argument against Steve Jobs wanting the Apple II to be a glorified appliance with only built-in applications. A lesson he still hadn't fucking learned by the time the iPhone came out.
Lotus 1-2-3 was the IBM PC answer to that 8-bit microcomputer program. VisiCalc had a DOS version, but it was a deliberately identical port. Bugs and all. Lotus bought the company within two years of launching its properly modern competitor.