K-Lite Pro is the best available file-sharing program. It gives you access to files available all over the world for FREE. K-Lite Pro is the world's fastest P2P file-sharing application, letting users share and search for any type of computer files. Download MP3s, Movies, Videos, Software, and Games. The application is easy to install, and very easy to use. Features include dynamic querying, the ability to preview files while downloading.

Aquila started as a way for me to download various torrents without actually visit those pop up sites. It has a very simple interface but underneath it lies about thousand lines of code, with multi thread support for efficient GUI response and more.