Uber (https://developer.uber.com/)
WearScript (http://www.wearscript.com): a development environment for Google Glass
Fitbit (http://www.fitbit.com/): activity and habit tracking
Jawbone (https://jawbone.com/): similar to fitbit, also has a speaker/headset product line
Smartthings (http://www.smartthings.com/): smart home controller
Lifx (http://lifx.co/): wifi-enabled, multi-colored, energy efficient LED light bulb (controllable from web APIs and phones)
Nest (https://nest.com/): produces multiple smart home-automation solutions such as thermostat and smoke/CO alarm
Dropcam (https://www.dropcam.com/): part of the Nest family, programmable remotely viewable/controllable home monitoring system
Keenhome (http://www.keenhome.io/): Smart vent for temp control
Weather underground (http://www.wunderground.com/): weather api for developers
ESRI (http://www.esri.com/): Geographic mapping
Occipital Structure Sensor (http://structure.io/): 3D sensor
Leap Motion (https://www.leapmotion.com/): motion detection
Softkinetic (http://www.softkinetic.com/): gesture recognition/control
Metaio (http://www.metaio.com/sdk/): augmented reality development tools
Google glass/Epson Moverio/Vuzix M100: augmented reality hardware