FF Multi Converter is a simple graphical application that converts audio, video, image, and document files between all popular formats, using and combining other programs. It uses ffmpeg for audio/video files, unoconv for document files, and the ImageMagick library for image file conversions.
wp-popeye (Popeye) presents images from the Wordpress media library in a nice and elegant way within your posts and pages. Use it to save space when displaying a collection of images and offer your users a simple way to show large versions of your images. It is based on jQuery.popeye and does not employ a disruptive modal window to display large images, allowing all thumbnails and the large images to be browsed in a single image space. It also repects the page flow and stays anchored and rooted in the Web page at all times. The plugin is very easy to set up and integrates automatically into your posts, or allows you to use a shortcode. It comes with several styles but can be also easily customized.