WordPress.org

This plugin provides a widget and a filter to display a collapsible list of categories in your sidebar or posts by using jQuery.

Features

1. Display a collapsed list of your categories to reduce space.
2. It uses jQuery for effects and to make them work with most browsers.
3. Select the symbol for expanding/collapsing categories
4. Select categories to exclude, so it shows only the categories you want.
5. Autoexpand selected category (including it parent or child).
6. And more to come...