Calameo is a free platform where you can publish your magazine, presentations or documents and share them with the world. It also lets you embed rich-media content to your publications like videos and audios.
2- Docuter
3- Wepapers
Webpapers lets you store all your papers, exams, lecture notes and research work in one place, and get organized. You can also use it to share and make your documents available to the world.
4- Share Zoho
Share Zoho allows you to browse files based on different file types ( ppt,pdf,doc ) and also collaborate in the form of : commenting. flagging, rating, bookmarking, and chatting.
5- Edocr
6- Scribd
Scribd is an awesome online library where you can search for, read, publish, upload and share documents and written words.
7- Eight Free Tools to Share your Slideshows and Presentations
This is a post I have published earlier and where I have reviewed 8 awesome free websites where you can share and publish your docs and presentations. Check them out.