Disclosure: Red Hat employee As of the most recent analysis that I've been able to find [0] (2018), Red Hat was the #1 most active corporate contributor to the

Disclosure: Red Hat employee As of the most recent analysis that I've been able to find [0] (2018), Red Hat was the #1 most active corporate contributor to the kernel (drivers excluded - Intel and AMD do a lot of support for their own hardware), IBM was #2, and Amazon isn't even on the list. And while I can't find any statistics on contribution breakdowns for GCC, glibc, Xorg, Mesa, Grub2, and other important pieces of the ecosystem, Red Hat does a lot of maintenance and development work outside of the kernel as well. * Pipewire (Wim Taymans) * RADV Mesa Vulkan Driver (David Arlie) * Firefox Wayland support + hardware acceleration support + GCC compilation validation (Martin Stránský) * The plurality of GCC and Glibc and (until recently) Xorg maintainers And so it goes with a lot of other components. [0] https://lwn.net/Articles/775440/ https://lwn.net/Articles/775440/ (I actually found more recent ones after posting this, they look mostly similar although IBM dropped further down the list)