basic collaborative and drive like office online or google docs

IMPORTANT NOTE: no violation of intellectual property rights requested here. Real Time Collaborative Editing (RTCE) apps, algorithms, research and more commonly available as public domain and non-GPL source code under licenses such as Apache/BSD/MIT/etc. Any company names or products are used for ease of reference in this description. If you have experience with OT, you'll be fine. However, if you have experience with the alternatives and understand the advantages/disadvantages of current implementations ( even if not used to fulfill this project), we may utilize your services in the future. OT is well known, but will not list the alternatives to help weed out those with limited or narrow experience with RTCE. Any code used must be available for use as distributed software, not only SAAS (no GPL/APGL), unless you consult here first to clear and legal linking. If you use any of the available Apache/MIT/BSD/etc. implementations/components, that's fine, and please keep all appropriate copyright/License information in place. Not looking for you to build from scratch here. Again, no limited license GPL software such as owndrive may be used. Deliverable: office/google docs drive "clone" Specifics: 1)RTCE apps (microsoft names used): 1a) Word 1b) Excel 1c) Powerpoint 1d) Publisher 2) Drive A drive storage system where users docs are autosaved user searches for folders/files much be fast and live like on any linux system/search engine 3) Back/Front end account creation and management with permissions (GUI based for client and admin) Thank you!