Electronic Document Management System -- 2

I need to develop a Electronic Document (project) Management System similar to Aconex (Oracle) -- only the main features is required.
Please suggest an open source / Template and please modify it, instead of developing it from scratch.
This will be a web + mobile application.

Please watch the following videos for reference:
https://youtu.be/zz8oten7QE0
https://youtu.be/FZ515UMe3LU
https://youtu.be/9bOSCIU8NN8
https://youtu.be/22d__XbKxpg
https://youtu.be/Qqhp4WOqcBc
https://youtu.be/uMK1zvlBEYc
https://youtu.be/5bVO3g8hocY