Downloadermac is a Cocoa application for downloading items from the Internet. It frees up your browser for other tasks by reducing the load on your Web browser's process by creating a thread just for downloading items.(e.g. firefox-bin, safari). It is tested on both Panther (10.3.9) and Leopard (10.5).
FatRat is a download manager that is rich in features and is continuously extended. Its features include HTTP(S)/FTP/SFTP downloads, FTP/SFTP uploads, RSS feed support with special functions for TV shows and podcasts, BitTorrent support (including torrent creation, DHT, UPnP, and encryption), torrent searching, Support for SOCKS5 and HTTP proxies, RapidShare.com FREE downloads, RapidShare.com uploads, RapidShare.com link verification and folder extraction, RapidSafe link decoding, MD4/MD5/SHA1 hash computing, remote control via Jabber or a Web interface, and YouTube video downloading.