Fine Uploader
Multiple file upload plugin with image previews, drag and drop, etc.
Multiple file upload plugin with image previews, drag and drop, progress bars. S3 and Azure support, image scaling, form support, chunking, resume, pause, and tons of other features. A fully customizable progress bar is included in UI mode. Core users can build their own with the help of a friendly API. Drag and drop files (and even folders in Chrome and Opera) straight from your desktop. Sometimes the network misbehaves. Fortunately, Fine Uploader can detect these sorts of disturbances and notify the user, or even automatically retry uploading the failed piece. Pause an in-progress upload when you know you are about to go offline, and safely resume them again right where you left off. Splitting a file into smaller pieces allows for a more efficient overall upload, and powers some Fine Uploader features such as pausing, and resuming uploads. Fine Uploader can also upload multiple chunks for the same file concurrently.