Sharing a folder or file with something like Dropbox is easy, but you have to actually have a Dropbox account to do it. OneTimeBox does the same thing, but you don't need an account and anyone can add files to the folder.
OneTimeBox is all about disposable files. To start, you create a box. Then you dump your files in there, share the URL with anyone you want to contribute to it and start sharing those files. Anyone with the link can add or delete files. It's simple and an easy way to quickly share files with a large group of contributors without worrying about accounts.
Obviously you don't want to do anything too private or important here, but it works well for all those disposable files you need to share around.