Linux: If you've built the home theatre of your dreams, and it's powered by XBMC, Maraschino is a simple, open-source front-end interface. It's web-accessible and makes managing your media and downloads super easy.
Your HTPC probably pulls double duty as a media library and possibly even a downloading machine. If it does, Maraschino gives you a simple web interface you can use whether you're on your tablet in front of the TV or at a computer far away from your home to play media, organise your library, and start/stop/control your downloads.
Maraschino can control your XBMC machine, other XBMC servers, Usenet downloads via SABnzbd+, and it can search Usenet for new downloads and start them for you. It also features uTorrent and Transmission modules to control those applications, a Sickbeard module so you can browse upcoming TV episodes and manage those downloads.
You'll need XBMC Eden installed for Maraschino to work, and it's remarkably similar feature-wise to previously mentioned HTPC Manager, although Maraschino seems a little more lightweight and easier on the eyes. It's free, customisable and easy to install. Hit the link below to give it a try.