Django Python中的文档文档，电子表格，演示文稿编辑器

I've been trying to research for awhile now and I am not getting anywhere so I decided to ask here. My project is made in Django and I want to add Text Document, spreadsheet, Presentation editors to it (like google docs). I am not sure how to approach this problem. I am willing to even create these from scratch. But I am not sure where to start. Any book, links, API that I can begin with?I've been trying to research for awhile now and