Here is a bunch of links to Mac Apps that I use, or have used, or have been meaning to use but may not quite have gotten to as yet.
Soundboard – Ambrosia Software, Inc.
Audio Queuing app for sound effects and the like. Really handy when playing sound effects for a live stage show or radio presentation – Associate iPad app available
Transmit – Panic, Inc.
FTP client for Mac, easy to use and reliable
Airmail – Bloop S.R.L.
Alternative Mail App – fully functional, exchange compatible and has a few nice features to improve the handling of multiple mailboxes
Wunderlist: To-Do List & Tasks – 6 Wunderkinder
To Do/Task list syncs well with accociate iOS Apps