k10ctl is a P-State utility for AMD family 10h (aka K10) processors. It can modify the P-States, i.e. alter processor and the northbridge frequencies and voltages, set or change the P-State, and read out frequency and voltage information. The main purpose of k10ctl is overclocking or "undervolting" the CPU and to configure Cool'n'Quiet settings.
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.
libcpu is a library that emulates several CPU architectures, allowing itself to be used as the CPU core for different kinds of emulator projects. It uses its own frontends for the different CPU types, and uses LLVM for the backend. libcpu should be able to do user mode and system emulation, and dynamic as well as static recompilation.
I-Nex gathers information for hardware components available on your system and displays it using an user interface similar to the popular Windows tool CPU-Z. It can display information for CPU, GPU, Motherboard, Sound, Hard disks, RAM, Network, and USB, as well as some system information like the hostname, Linux distribution and version, Xorg, GCC, and GLX versions, and Linux Kernel. It can also generate a report on which you can select what to include and optionally send the report to a service such as Pastebin (and others). It also features an option to take a screenshot of the I-Nex window directly from the application.