... OpenOffice too! And DTrace, ZFS, Solaris Containers(zones) as inspiration to LXC/LXD,
By open sourcing whole Solaris through OpenSolaris initiative under CDDL, everybody got access to SMF - init V system replacement, Crossbow network virtualization stack and other nice stuff.
Another open source activity was OpenSparc, OpenBootPrompt, giving blueprints to Sparc T1000/Niagara HW, which is now more or less integrated in QEMU.
Sun was giving full truckloads of high quality engineering to the world.
I'm proud to have been the Sun employee.