PC Monitoring Applications

I'm looking for an application that can monitor the internals of my PC. Like CPU temp, GPU(nvidia) temp, CPU & GPU activity, memory usage, hard drive space and temps, and so on. I don't really care if it's a widget or program. I just want something full featured, fast, and hopefully free.

What do you guys use? Any suggestions?

I use MSI Afterburner along with Riva Tuner Statistics to check on CPU and GPU usage while playing games. It also allows you to see the how much memory and VRAM is being used along the temperatures for both CPU and GPU, among other things.

Probably hwmonitor

SpeedFan - shows temps of all components.

Speccy !!!

https://www.piriform.com/speccy

Simple, easy to read and effective. What more can you ask for?