c2ctl is a frequency and voltage modification utility mainly intended for Intel Core 2 and Core CPUs. It should also work for other CPUs (namely processors with SpeedStep). The utility can also enable SpeedStep (e.g. if it was disabled by the BIOS due to overclocking) and read out frequency and voltage information. The main purpose of c2ctl is overclocking or "undervolting" and to enable SpeedStep.
pmu tools is a collection of tools for profile collection and performance analysis on Intel CPUs on top of Linux perf. It has a wrapper to "perf" that provides a full core event list for common Intel CPUs. This allows you to use all the Intel events, not just the builtin events of perf. Support for Intel "offcore" events on older systems that do not have support for this in the Intel. Offcore events allow you to profile the location of a memory access outside the CPU's caches. It implements a workaround for some issues with offcore events on Sandy Bridge EP (Intel Xeon E5 first generation). This is automatically enabled for the respective events, and also available as a standalone program. Some utility programs to access pci space or msrs on the command line. A utility program to program the PMU directly from user space (pmumon.py) for counting. This is mainly useful for testing and experimental purposes. A library for self profiling with Linux since Linux 3.3 (for self-profiling on older kernels, you can use simple-pmu. An example program for address profiling on Nehalem and later Intel CPUs (addr). A program to print the currently running events (event-rmap).