Vectary - Vectary is a free, online 3D modeling tool and sharing platform.
Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
Spline - Design tool for 3d web experiences
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!
Homies - Growing 3D scene constructor with characters, backgrounds, and objects for outstanding design projects.
JACK Audio Connection Kit - JACK Audio Connection Kit|Home