With Amphetamine, you can effortlessly override your energy saving settings and keep your Mac awake. You just have to tap on a single icon on your macOS Menu Ba. Once activated, your system will stop going to sleep. You can also set it up so that Amphetamine only kicks on when it notices that a particular app is running.
AnyBar
AnyBar is a small indicator for your menubar that does one simple thing: it displays a colored dot. What the dot means and when to change it is up to you.
AnyIpsum
AQI
ARD Monitor
ARD Monitor shows the state of your Apple Remote Desktop (disabled, enabled, connected) – even if the Administrator asked for permission to monitor/control. You can also disconnect connected administrators. It displays your IP- and MAC-addresses, computer name and serial number.