A 3D benchmark comparing the different features / extensions of OpenGL. Made for the Linux operating system, but is portable to any other OS that SDL supports.
MRTG-PME is a set of performance monitoring extensions to MRTG that allow historical graphing of OS performance data (CPU, memory, paging, disk, etc.) for Linux, Solaris and BSD. With no SNMP required, PME is arguably more secure than standard MRTG.