The best alternatives to FastScripts 3 are Today Scripts, BitBar, and Boop. If these 3 options don't work for you, we've listed a few more alternatives below.
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Today Scripts is a widget for running scripts in macOS's notification center. Make your Today View useful. Bash, python, ruby, even apple scripts. This open source app is made by SamRothCA 4 years ago. Now I made it works on the latest macOS.
Putting web apps outside of a browser is one of the best ideas ever. That's why Boop is built with javascript, with all of that webpage-on-desktop goodness.
Eggshell is a simple BASH script manager for Mac. Just add your scripts to Eggshell, and run them from your menubar. It's the easiest way to quickly set up local dev environments or run any frequently used scripts.
Ambi Launcher is utility for quick app switching on Mac. It allows to launch apps with quick move of pointer to the edge of a screen and back. It's faster then tapping on icon in dock. Even more it launches AppleScript scripts so you can use it to activate a tab with Producthunt site. Lite version is FREE!