The Linux OS, even in 1993, was a combination of Linux kernel plus GNU userland tools and compiler plus X11 plus assorted goodies from the BSD world. Developed

The Linux OS, even in 1993, was a combination of Linux kernel plus GNU userland tools and compiler plus X11 plus assorted goodies from the BSD world. Developed, at least the first bit of time, on Minix, a Unix-like operating system that a university professor wrote as a teaching tool and gave away under a shared source license. Linux' use of GPL was better than the shared-source license of Minix because you could distribute patched Linux kernels but had to distribute Minix improvements as patches to the original distribution. Linux' use of GPL was also what led everyone to contribute back to Linux while BSD derivatives were silently used to bootstrap software (including MacOSX) that never contributed back. Linux also shows two properties that make up successful open source: there's an "inside" (kernel-land) and an "outside", and everyone profits if the inside-OSS part is made better and better while having minor kernel improvements is not a huge differentiator for most companies. Contrast with the Redis addons by Redislabs: they want the ecosystem aspect of open source - people contributing back patches. But they also want to be the only ones to gain a livelihood from their code (which is their right as creators of the software but not conducive to the growth of an ecosystem). And they want their license to be treated as Apache-License-related, which is the part that smells of make-believe and dishonesty. But observe the part of having an ecosystem of different software parts (here: Redis and RedisLabs' extensions) that have an inside and an outside, as well as an ecosystem of developers/users who can make and share improvements to the software.