2. Password Strength
This plugin can detect the strength of your password.
A plugin for jQuery which changes the dimensions of input elements to suit the amount of data entered. It operates on textarea, input[type=text] and input[type=password] elements.
This plugin takes care of your input fields. Often used by opt-in input fields where the default value of the field is something like “Your e-mail address”. If you click the field the text disappears so that you can type your e-mail address.
6. jQuery Mask Plugin
A jQuery plugin to make field masks.
The jQuery plugin that suggests a right domain when your users misspell it in an email address.
8. jQuery FIle Upload
File Upload widget with multiple file selection, drag&drop support, progress bars and preview images for jQuery. Supports cross-domain, chunked and resumable file uploads and client-side image resizing.
9. Autotab – jQuery Auto-tabbing and Filter Plugin
Is a jQuery plugin that provides auto-tabbing and filtering on text fields in a form. Once the maximum number of characters has been reached within a defined text fields, the focus is automatically set to the defined target of the element.
TextExt is a plugin for jQuery which is designed to provide functionality such as tag input and autocomplete.