- Without output sun gear: https://saugstad.net/gear-animation/
- Clock: https://saugstad.net/gear-animation/clock.html
- Planetary: http://www.thecatalystis.com/gears/
- https://saugstad.net/gear-animation/calculate.html
- https://github.com/IdeaPropulsionSystems/CoolEpicyclicGearing
- https://github.com/Juan-Gg/Differential-planetary-gearbox-calculator
- https://www.youtube.com/watch?v=-VtbSvVxaFA
- https://www.youtube.com/watch?v=P-Obt-9tZVo
- https://www.youtube.com/watch?v=7hJqxlgx2ps
- https://www.youtube.com/watch?v=4gkbb2CBzQI
- https://juangg-projects.blogspot.com/2018/02/split-ring-compound-epicyclicplanetary.html
- https://drivetrainhub.com/notebooks/gears/geometry/Chapter%204%20-%20Planetary%20Gears.html
- https://cdn.intechopen.com/pdfs/35257/InTech-Split_torque_gearboxes_requirements_performance_and_applications.pdf
- Gear Cloack: https://saugstad.net/gear-animation/clock.html
- Involute GEars with JS https://output.jsbin.com/oresos/latest