Cross-platform: Dropbox, Sublime Text, Toodledo, Balsamiq Mockups, Pinboard, Newsblur OSX: Alfred 2, Dash, Pixelmator, Clearview Win: ExpanDrive Other: Linode, Dreamhost (legacy)

Funny enough, my home machine is Windows and I spend far more money on productivity tools for my work (OSX) machine. I'm not counting Steam.