"Woof (Web Offer One File) is a tool to copy files among hosts. It can serve a specified file on HTTP, just for a given number of times, and then exits."
"Peer-to-peer file transfers in your web browser."
Share files directly using BitTorrent
"image host that lets you paste images from your clipboard directly online. Any kind of image, from raw data to URL paths, can be pasted in one step." Also supports basic editing (crop, paint, text).
"converts Microsoft Office and PDF documents to HTML5 so your users can view and collaborate right in your web app", plus annotation, note taking, collaboration and sharing
ZeroBin is a minimalist, opensource online pastebin where the server has zero knowledge of pasted data. Data is encrypted/decrypted in the browser using 256 bits AES.