Transmission is a BitTorrent client which features a variety of user interfaces on top of a cross-platform back-end. Transmission is free software licensed under the terms of the GNU General Public License (GNU GPL), with parts under the MIT License. Transmission allows users to quickly download files from multiple peers on the Internet and to upload their own files.[5] By adding torrent files via the user interface, users can create a queue of files to be downloaded and uploaded. Within the file selection menus, users can customize their downloads at the level of individual files.