My brother asked me to customize firmware in his WiFi router TP-Link TL-WR1043ND. He wants to use if for downloading torrents and sharing them using smb and ftp protocols.
I have good experiences with OpenWrt, which is really good in customization and suits well for this purpose. Nowadays you there are few torrent clients in OpenWrt distribution, but I choose transmission and for ftp daemon vsftpd.
My personal blog about Linux, opensource applications and related technologies.