Almost a year ago (on the 6th of April), I began a project - similar to this, called "Mesh Composer". I have since come to terms with the fact that... well... the code isn't that good. Anyway, I decided to redo Mesh Composer - which is this project - which was started somewhere around the 4th of March (I think).
Matrixr was designed to be very easy to use. You can either download the project & run the index.html file, or you can just view the project via Github pages - https://chillitech.github.io/Matrixr/.
I would be grateful if you were able to contribute in any way! Feel free to either find something to help with in the projects board - or if you would prefer to do something else, just open a new issue, and assign yourself to it. Please also feel free to post any questions or comments in the "discussions" section! Any contribution is fine - code, documentation, etc.