OverWolf Is Same as "Xbox Game Bar" but it's WAYYYYYYY smoother! It's perfect for low-end-pc so "Xbox" works fine on high-end pcs and "OverWolf" works good on low-end pcs, don't ask me about mid-end pcs lol..
Xbox Game Bar - A customizable gaming overlay built into Windows 10 👾
MSI Afterburner - Tool to manage video cards. Shows video card stats (temp, GPU usage, etc.).
OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.
ASUS GPU Tweak - ASUS GPU Tweak fully implements TechPowerUp’s GPU-Z analysis and monitoring features.
Nvidia ShadowPlay - ShadowPlay
Guru3D - Guru of 3D: PC Hardware Reviews and tests