1- jQuery inline form validation
2- Uniform
3- Autotab
4- jquery Niceforms
5- jquery Form Validator
6- Toggle FormText plug-in
7- jQuery Field Plug-in
8- In-Field Labels jQuery Plugin
9- jQuery Comment Preview
10- Input Fields with Images
11- Pretty Comments
12- jQuery Highlight Plugin
13- Select Multiple Form Fields
14- Password Masking jquery plugin
15- jTip
16- Password Strength Indicator and Generator
17- Live validation
18- jQuery Autosave
19- jQuery Dropdown Checkbox
20- jQuery Ajax Form Builder
21- Perfect signin dropdown box likes Twitter with jQuery
22- Checking username availability with ajax using jQuery
23- jqTransform
24- Magicpreview plug-in
25- A Fancy AJAX Contact Form
26- AJAX Upload
27- Current Field Highlighting in Forms
(编译来源:梦想天空 原文来自:25+ jquery Form Plugins)