Open Authenticator - A trusted open-source Authenticator. Formerly known as SmartWatch2 Authenticator free.
Caffeine for Mac - Caffeine is a tiny program that puts an icon in the right side of your menu bar.
Caffeine for Windows - Caffeine.
SmartSleep - SmartSleep lets you select each sleep state.
Should I Sleep - Annoyed by the display getting dim when you're reading or watching something?
KeepingYouAwake - A Caffeine clone for macOS Yosemite, El Capitan and Sierra (including Dark Mode).