CONV. - Convert YouTube video to MP3, GIF or MP4
Viz4D - Viz4D helps you create top-performing web-based 3D viewer that works great on mobile and VR. It is tailored for real-time Archviz walkthrough, 3D product configurator and presentation.
Downie - Video download for OS X. Downie supports at this moment over 1,000 different sites.
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.
Yout - YouTube to Mp3 Converter
Sketchfab configurator - Build your real-time 3D configurator