Construct 2
Godot Engine
GDevelop
Unreal Engine
BYOND
Corona SDK
Defold Engine
Unity
Week
Motion
Doneit
Everlist Task Manager
Taskade
Oka Todo
TaskFino
Tinido
Godot Engine - Feature-packed 2D and 3D open source game engine.
Motion - All-in-one time management tool in Firefox
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Doneit - Doneit offers a variety of tasks views, such as list, grid, board, and timeline to help you manage your tasks and projects of any complexity with ease.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Everlist Task Manager - Groceries, trips, errands, and daily todos managed simply. get your tasks under lovely control.