Hwmonitor is useful, as is CPU-Z, GPU-Z
intel burntest for your clocking stability tests,
coretemps a handy one for putting your temps onto the taskbar
msi afterburner is popular for gfx cards or use amd's catalyst centre if you prefer (should've gotten that with the driver disk)
speedfan will adjust fans but can be glitchy with some things,
thats about all I can think of atm
Moto