Some apps I use every day:

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Homebrew - http://brew.sh/

Growl - http://growl.info/

Alfred - http://www.alfredapp.com/

Sublime Text - https://www.sublimetext.com

Transmission - http://www.transmissionbt.com/

Transmit - http://panic.com/transmit/

Evernote - http://www.evernote.com/

BetterTouchTool - http://blog.boastr.net/?page_id=1722

Dash - http://kapeli.com/dash

F.lux- https://justgetflux.com/