The most important I can think about right now is a CLI Mac app to install apk/ipa on devices (iOS and Android). You see, my company has about 10 apps, all sor

The most important I can think about right now is a CLI Mac app to install apk/ipa on devices (iOS and Android). You see, my company has about 10 apps, all sort-of maintained, that we manually test on several devices for each single feature (because not having bugs is very important). Previously, devs (we are only 2 devs) were disturbed all the time to build apps and install them on specific devices. Because I was fed up being disturbed all the time, I automated all builds, then created a CLI app to install the nightly build on all USB-connected devices at once. Then teached the QA guy how to SSH onto the build machine and invoke the command to install. It's used daily, several times a day.