NVCleanstall - NVCleanstall lets you download/update and customize the NVIDIA GeForce Driver package by removing components that you don't need (or want). This not only keeps things tidy, but also lowers disk usage and memory footprint.
Geforce Experience - GeForce Experience is a new application from NVIDIA that optimizes your PC in two key ways.
Lutris - Lutris is an open source gaming platform for GNU/Linux.
Playnite - Source code generated using layoutit.com
Batocera.linux - Batocera.linux is an open-source and completely free retro-gaming distribution that can be copied to a USB stick or an SD card with the aim of turning any computer/nano computer into a gaming console during a game or permanently.
MSI Afterburner - Tool to manage video cards. Shows video card stats (temp, GPU usage, etc.).