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Open Source Projects Index: X & Y

X.Org
X.Org Foundation is the worldwide consortium empowered with the stewardship and collaborative development of the X Window System technology and standards.
Xen
Xen is a virtual machine monitor for x86 that supports execution of multiple guest operating systems.
XFS
XFS combines advanced journaling technology with full 64-bit addressing and scalable structures and algorithms.
XML Forms Generator
XML Forms Generator now includes a schema-flattening utility, an auto-detect renderer option, Eclipse V3.2 support, and Eclipse WTP V1.5 support, and more. This standards-based, data-driven Eclipse plug-in generates functional forms with XForms mark-up embedded within an XHTML document on Red Hat.
Yaboot
Yaboot is a PowerPC bootloader for Open Firmware based machines including New World Apple Macintosh, IBM RS/6000, IBM pSeries and IBM OpenPower machines.

Courtesy: IBM