DropzoneJS
Dropzone is an easy to use drag'n'drop library. It supports image previews and shows nice progress bars.
JavaScriptFile UploadjQuery File Upload
File Upload widget with multiple file selection, drag&drop support, progress bar, validation and preview images, audio and video for jQuery.
jQueryFile UploadFine Uploader
Multiple file upload plugin with image previews, drag and drop, progress bars
JavaScriptFile UploadjQuery Form
Easily and unobtrusively upgrade HTML forms to use AJAX
jQueryFormSlim Select
Slim vanilla javascript select dropdown
JavaScriptForm