[kyberias]

uTorrent used to be really efficient, small memory-footprint, full featured bittorrent-client. One of the best software I've ever used to download... perfectly legal content [1] from the internets.

Now it's full of ads and performs poorly.

[1] Like all the different Linux distro install images over and over again.

[pwg]

Take a look at rtorrent: https://github.com/rakshasa/rtorrent

It fits the efficient, small memory-footprint and no ads requirements. "Full Featured" is subjective as it depends upon what you consider "Full Featured".

[kyberias]

Full featured means that it efficiently implements all the bells and whistles of the most recent bittorrent protocol. And only that, nothing extra.