The best open source alternative to TextExpander is AutoHotkey. If that doesn't suit you, our users have ranked more than 50 alternatives to TextExpander and 17 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to TextExpander are Microsoft PowerToys, espanso, Beeftext and Karabiner Elements.
AutoHotkey is an open-source Windows scripting language for task automation. It crafts scripts for operations like form filling and auto-clicking, initially starting with hotkeys yet evolving into a complete script language. Converts scripts to executables, works offline, and supports debugging.
Open-source utilities for Windows include FancyZones for window management, PowerRename for bulk renaming, and Keyboard Manager for custom shortcuts. Ad-free, supports multi-monitor setups, no registration needed, lightweight resource usage, and works offline.
Simple, free, and open-source. Beeftext does the job.
Beeftext is opensource and works very well in Windows. You can install or use the PortableApps version. RichText support has been added in the last version 6.0.
It's free and open source.
Karabiner, previously called KeyRemap4MacBook, is a very powerful keyboard remapper for Mac OS X. In addition to simple key remapping, it has special remapping modes like Emacs-mode, SandS-mode (Space and Shift).
Lintalist allows you to store and (incrementally) search and edit texts in bundles and paste a selected text in your active program. The text can be interactive, for example you can automatically insert the current time and date, ask for (basic) user input or make a selection...
Free, powerful & customizable
This tool lets you simulate keyboard input and mouse activity, move and resize windows, etc. It does this using X11's XTEST extension and other Xlib functions.
AutoKey is a desktop automation utility for Linux and X11. It allows you to manage collection of scripts and phrases, and assign abbreviations and hotkeys to these. This allows you to execute a script or insert text on demand in any program.
PhraseVault is a text expander and snippet manager for Windows and macOS. Save frequently used text — email templates, AI prompts, code snippets, form data — and insert it anywhere with a keyboard shortcut.
KeyTik is an open-source, all-in-one automation tool that lets you automate nearly anything at your will. Initially, KeyTik focused on being a keyboard remapper with profiles, allowing you to activate or deactivate each remap individually.
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Open Source, cross-platform, good configuration interface (yaml!)