Just Unzip - Just Unzip (LGPL Licensed) takes a zip file you upload from the "Write" page, unzips it, stores the zipped files in your upload folder, and associates the unzipped files with the current post. Just Unzip makes use of the PclZip php library (LGPL Licensed).
Link Indication - Applies css class attributes to the links (anchor tags) in your posts, pages, and optionally in your comments. Thereby you can indicate your links, e.g. by images, for characterizing your types of links. Also, you can define your own link types (e.g. flickr, del.icio.us, imdb, etc.) for up to 10 different types.
Main categories - Allows you to set categories as main or secondary, or divide them into sections or topics. Widgets, template tags and batteries included.
Maintenance Mode - Allows you to make your blog temporarily unavailable to your visitors with a custom message. It is still accessible by the administrators and logged in users.
Visualizer - Allows readers to leave a visual comment, presenting what they experienced while reading your post. Adds a moodboard of all visualizations to your post.
WP-Ban - Ban users by IP or host name from visiting your WordPress's blog. It will display a custom ban message when the banned IP/host name trys to visit you blog. There will be statistics recordered on how many times they attemp to visit your blog. It allows wildcard matching too.
WP-DBManager - Manages your Wordpress database. Allows you to optimize database, backup database, restore database, delete backup database , drop/empty tables and run selected queries.