Easy Media Gallery is designed to display portfolios and various media types including gallery sets, single images, google maps, video, audio, and links with ease and elegance.
ytlink provides a preview image for embedded YouTube videos.
BackWPup allows you to backup your WordPress database, files, and more.
Keyring provides a very hookable, completely customizable framework for connecting your WordPress site to an external service.
WP All Import makes it easy to import any XML or CSV file into your WordPress site.