gobanana

This plugin will output a list of your chosen categories and filter the posts on the fly using jQuery animation.
The setting pages allows you to select which categories should appear, whether or not to include jQuery (if you don’t already have it in the ) and a place to define the posts container. This should be either the class or id of the div that contains all the posts for filtering.
I am open to suggestions to improve the plugin !
<h3>Plugin Site</h3>
http://gobanana.ca/wp-filters

WP-Filters

A live post filtering plugin. Choose which categories to show in the filter and watch the post show/hide without reloading.

wildoperation

Enables the confirmation anchor functionality for all Gravity Forms on your site. This is done using the gform_confirmation_anchor filter.
This plugin has no settings. Just enable the plugin. The confirmation anchor will be enabled on all Gravity Forms.
For information on Gravity Forms anchors, or to learn how to enable the anchor only for specific forms, please review Gravity Forms’ official documentation.

Enable Gravity Forms Confirmation Anchor

Enables the confirmation anchor functionality for all Gravity Forms on your site.

WP-Filters vs Enable Gravity Forms Confirmation Anchor