Aaron Booth has authored many games and apps. He started writing games before the existence of the popular engines. Later his experience has been using popular engines such as Unity3D and Unreal. Makegl started as an 'interesting' project during the CORVID lockdown.
While of course, this projects is far more limited in scope and features then the big players mentioned, it does achieve something they do not. A simple to use pure Javascript library that can springboard the user into actually understanding an engine rather than just using a GUI. Saying that I would like to create a GUI too one day.
Aaron has created other projects that are hosted here. If you are learning Javascript/Web development hope they can provide something helpful.
The above are just personal projects in spare time here and there. Aaron has previously worked on projects for governments, education, security and even military. He has been involved with A.I. research and development, from even before the recent media frenzy.