Slide Deck – Great slide deck presentation $50.
Button Pro – Button Pro is an easy-to-use and colorful set of buttons made in CSS3 $3
Premium Galery – Create galleries with just a few clicks, as many as you need, in any size you need and this together with it’s custom option panel and gallery submission panel you don’t need anything else anymore. $20
Easy Sidebar Generator for WordPress -Have you ever wanted to create a new sidebar and just didn’t know how? Here’s your solution. Easy sidebars generator makes it as easy as possible to create unlimited sidebars – Just choose its name and position and it’s ready $8
oCalendar – oCalendar is a jQuery plugin that allows you to add an event calendar to your sites or projects easily. You can add, edit and delete events from the client side $10
If you're looking for a tool, this appears to be a good place to start. Each of the scripts are also rated by the user community.