Godot Engine - Feature-packed 2D and 3D open source game engine.
Mac Mouse Fix - A simple way to make your 3rd party mouse better.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Smooze - Smooze animates your scroll and adds functionality to your non-Apple mouse (scroll-wheel mouse).
MonoGame - MonoGame is an open source implementation of the Microsoft XNA 4 Framework.
Smart Scroll - Smart Scroll makes scrolling smoother, faster and more comfortable: