Non-profits that want to manage their own Internet based systems will ultimately find themselves needing to use File Transfer Protocol (FTP). Basically FTP allows you to move files from one computer--your local computer, to a second computer--often a server. It was originally developed for UNIX and is a main-stay for those developing Web sites.

I've used many different FTP clients on the Mac. Before OSX I used Fetch--a strong client that was ported to OSX. It originally had a free scaled down version that was easy to use but now is limited to a 14 day trial.