The Openwall Linux kernel patch is a collection of security "hardening" features for the Linux kernel. In addition to the new features, some versions of the patch contain various security fixes. The "hardening" features of the patch, while not a complete method of protection, provide an extra layer of security against the easier ways to exploit certain classes of vulnerabilities and/or reduce the impact of those vulnerabilities. The patch can also add a little bit more privacy to the system by restricting access to parts of /proc so that users may not see what others are doing.
CD-R/W discs can be written with a technique called packet or incremental writing. This allows transparent and buffer-underrun-free recording for CD recorders that support this method. No more mastering of .iso images; just mount your CD-ROM read/write and copy files directly to it.
proconfig is a Linux kernel patch which lists the running kernel's compilation options in /proc/config. This makes kernel image administration easy if you compile a lot of kernels or admin a lot of machines. The code is compiled as a kernel module by default. The patch integrates with the kernel Makefiles, so it shows up conveniently under make menuconfig and friends.
ReactOS is an advanced operating system providing a ground-up implementation of a Microsoft Windows XP compatible operating system. It aims to achieve complete binary compatibility with both applications and device drivers meant for NT and XP operating systems by using a similar architecture and providing a complete and equivalent public interface.