Linux kernel
4.0.0
13 Apr 2015

Linux is a mostly POSIX-compliant Unix-inspired operating system kernel, originally implemented by Linus Torvalds and now maintained as an international project. It's the base and common namegiver to a wide array of Linux distributions. The kernel provides all modern Unix-y features, like true process multitasking, virtual memory, virtual and clustered filesystem support, complex networking and extensive support for various hardware and machine plattforms.
major feature: Release named "Hurr durr I'ma sheep". Drivers for AMD Radeon now support DisplayPort, Carrizo APUs. Intel and Nouveau graphics drivers were enhanced, and some new DRM drivers introduced. File system support for F2FS, OverlayFS read-only layering, VirtIO, RAID improvements, pNFS block access support as used by XFS. CPU support for x86 Intel Quark SoCs, many new ARM variations, KVM optimizations on x86, ACPI enhancements for AMD and Intels Skylake, and IBM Z13 systems. Bootloader fixes for Sony PS3. Trusted Computing Modules 2.0 support. Sound driver fixes, new input drivers.