Cross Compiling Tools For Routers

I have been searching for a solution to the Torrent problem I have. I sometimes need to download few hundreds gigabytes of torrents, meaning I need a stationary PC at home to download. My PC makes a lot of noise and probably taking a lot of electricity. The RPi I own is used for experiments, and also it fried during my last experiment (RF Switches). The only running system I have is the router I got from my ISP, Bezeq.