Create a virtual classroom software

Hello, our company is looking for a freelancer, which could develop software for virtual classroom, which would connect to future LMS API. This software includes conferencing, video sharing, application sharing and so on. Features are specified in document bellow. This application should be modern looking, easy to re-brand (default same as desing of LMS). There could be some possibility of using this software on mobile devices (iOS, Android) but it is not main condition. Result would be application with documented code and documentation about using this. Please post (when bidding) technology, which you would do that.