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.
TextExpander - TextExpander: Communicate Smarter. Gather, Perfect, Share Your Knowledge. Recall your best words instantly, repeatedly.
Hunspell - Hunspell is the spell checker of LibreOffice, OpenOffice.
AutoHotkey - The ultimate automation scripting language for Windows.
tinySpell - A spell-checker for Windows. Checks text in clipboard and/or on the fly in any Windows program. Small and easy to use. Resides in the taskbar notification area. Free download.
Beeftext - Beeftext is an open-source text substitution tool for Windows.
ispell - Ispell is a program that helps you to correct spelling and typographical errors in a file.