CAM - Simple PC software that allows you to monitor hardware, fps/temps overlay and overclock ( Free download)
I came across this piece of software today after watching a YouTube video. You can see the temperature of your CPU and GPU and also have an overlay of them in your games. That is what I have use it mainly for as it's very simple to use. It has other features too such as overclocking but don't mess with that unless you know what you're doing!
Link : https://camwebapp.com/
Here is the details:
Track frames per second (FPS) for all of your favorite games
Effortlessly overclock your GPU and push your FPS to the max.
Gain access to a wealth of information including detailed graphs and in-depth stats
Instant warning when components aren't functioning properly
Display key temperatures and performance metrics in-game
Monitor CPU and GPU temperature at all times
Review your PC's historical data to identify abnormal activity
See your FPS stats for your most recent game sessions
Most importantly, it's free. You just need to create an account. Hope it's useful to some.
Ps. Seems to use less than 100mb of memory, so fairly lightweight.