PostImage.org - Provides free image upload and hosting integration for forums.
Mega - Secure File Storage and collaboration
Pixeldrain - Fast and easy file sharing, drop a file into the website and get a shareable link right away.
Dropbox - Online Sync and File Sharing
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
MediaFire - MediaFire is the simple solution for uploading and downloading files on the internet.