Cyberduck – FTP and SFTP Browser for Mac OS X
Cyberduck is an open source FTP and SFTP (SSH Secure File Transfer) browser licenced under the GPL with an easy to use interface, integration with external editors and support for many Mac OS X system technologies such as Spotlight, Bonjour, the Keychain and AppleScript. It works great with Smultron.

Smultron – Free Text Editor For Mac OS X
Smultron is a free text editor for Mac OS X which is both easy to use and powerful. It is designed to not confuse newcomers nor disappoint advanced users. It also integrates well as an editor for Cyberduck.

VLC media player – cross-platform media player
Probably the best free desktop video player out there, VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, …) as well as DVDs, VCDs, and various streaming protocols.