Content Management System Custom Made

We are in need of a professional programming team that can develop an online CMS (Content Management System) that would allow a user to create their on content. This CAN NOT be Open Source or third-party solution. It must be created by the winning bidder. You can use third party library tools, but not someone else’s system that is already out there. Really what is needed is something that can clone or mimic Microsoft PowerPoint, but would be an online version of such. It also does not need to be as complex as PowerPoint, but user would need the ability to Create Content, Add Images, Video and Audio files. The user should be able to publish or save this creation based on Slides or Pages. User should be able to create Interactive Content by accepting input from the person they wish to view the content or page online. If you believe you can create or have created such a system, then we look forward to hearing from you. Your previous work may also be requested as well.