BetterTouchTool is a great, feature packed app that allows you to configure many gestures for your Magic Mouse (1 & 2), Macbook Trackpad and Magic Trackpad (1 & 2) and also Mouse Gestures for normal mice.

Quicksilver is a fast and free macOS productivity application that gives you the power to control your Mac quickly and elegantly.

aText accelerates your typing by replacing abbreviations with frequently used phrases you define.

Boosts team efficiency by managing, creating, and sharing reusable text snippets across all platforms with support for fill-in fields, advanced customization, and insightful analytics to drive productivity and performance enhancement.

Automate applications or web sites, text or images, simple or complex, on command or scheduled. You can automate virtually anything.

This is a tool for powerful automation of OS X. At its core, Hammerspoon is just a bridge between the operating system and a Lua scripting engine.

With Automator, you can accomplish time-consuming, repetitive manual tasks quickly, efficiently, and effortlessly. Automator lets you skip the complex programming and scripting that is normally required to create automations.

This is a cross-platform software keyboard remapper for Linux, macOS and Windows. A short summary of the features:

Repeat is a full-fledged, Java mouse/keyboard record/replay and automation hotkeys/macros creation using modern programming languages, and more advanced automation features. Working across three major OSes: Windows, OSX, and Linux.

With Paletro, by pressing ??P, you have access to all of the functionality of current focused app, including keyboard shortcuts for the most common operations.

The missing gesture layer for macOS.

Simple and powerful keyboard enhancement on macOS.