Unity - The multiplatform game creation tools for everyone.
strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
Godot Engine - Feature-packed 2D and 3D open source game engine.
ftrace - A function tracer for the Linux kernel.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Valgrind - Valgrind is an instrumentation framework for building dynamic analysis tools.