PhraseExpress has streamlined my workflow and productivity for more than a decade. Setting it up is a breeze, and it integrates seamlessly with all my applications. The autocomplete function is saving me countless keystrokes. Kudos to the developers for the intuitive design and robust performance. Strongly recommended. There also is an ios version but I am on Android. A linux version would make it perfect.
Alfred - Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.
TextExpander - TextExpander: Communicate Smarter. Gather, Perfect, Share Your Knowledge. Recall your best words instantly, repeatedly.
Lacona - Fast, simple, powerful keyboard-driven commands for Mac
Beeftext - Beeftext is an open-source text substitution tool for Windows.
Power Menu for Finder - The workflow enhancing Finder extension for Mac
AutoHotkey - The ultimate automation scripting language for Windows.