1. Carbon Copy Cloner (Donationware. Pretty, highly customisable and reliable disk backup utility)

2. Growl (Donationware. System-wide notification utility with great integration with OS X as well Apple and third party apps)

3. Transmission (Donationware. Pretty, fast, bit-torrent client that currently shows that I have over 400 GB of torrents downloaded this year)

4. VLC (Freeware. Open source,cross platform, swiss army knife of a media player.) 

5. Synergy (Shareware, iTunes controller)

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Fives, Tech