Fetch for OS X
Jim Matthews has licensed Fetch from Dartmouth College and started a company called Fetch Softworks which develops and sells Fetch ($25), the uber-popular FTP application for the MacOS. Fetch 4.0 is Carbonized!
Update: Michael C. Dreimiller reminded me how it came to be that Jim Matthews licensed Fetch from Dartmouth! I just hadn't put two and two together. Neat! Jim Matthews must be one seriously passionate geek!