[hashtree]

App Store:

  Fantastical - NLP calendar and reminders.

  Day One - Journal that can be used to replace scribbled sticky notes and notebooks
  you have laying around.

  AirMail - Mail client.

  SomaFM Radio Player - Ambient music stations.

  Textual - IRC.

  Moom - Window management.

  Pixelmator, iDraw, Sketch, Inkscape - Graphics, ditch Adobe.

  Markdown Pro - Markdown editor. End up using for repo readmes and for most textual
  documents.

Non-App Store:

  Incanter - Statistical computing and graphics.

  iTerm2 - Terminal replacement.

  Pencil - Prototyping/mockups.

  Wireshark - Capture ALL the packets!

  Temperature Gauge Pro - Monitor all your hardware sensors and control your fans.
  Better than SMC (plays nicely with Haswell/Mavericks).

  VIM, Emacs, Sublime Text, jEdit - Solid editors.

  Homebrew - Everything else (even some of the editors, if you wish). Be sure to check
  out interesting taps too (e.g. science and nginx):
  https://github.com/mxcl/homebrew/wiki/Interesting-Taps-%26-Branches