This is a software similar to autocad. It is a fully open source both source code and output.This softawre is developed in HTML and Javascript only.It works in almost all browsers.So It is platform independent. Since it is an initial step to develop autocad working in web based browsers, only few features of autocad are included. You can see the source code of this sofware by view source in browsers and save it as html file to work as stand alone in your computers. No external files are included/linked in the source code. Simple comments of functions are also included for developers to understand the source code. The drawing file is also saved as text(ASCII) file which can be opened in any text editor like notepad.I wish all enjoy web based autocad. For Android I just converted that html file into app using Android Studio. You can see the following link for source code and user manual. http://mksugumaran.blogspot.com/2016/02/webautocad-web-based-autocad.html