inviita - inviita is a free app that instantly creates tours that match your mood, in any city in the world.
RoomForTea - A female-friendly housing network in London, UK.
She Roams Solo - Travel social networking platform and forum for women
tripcake - Doodle for travel plans with friends
Magpie - Female travelers club - meet women like you when you travel
Blink by Groupon - The leading app for last-minute hotel reservations. Always cheaper than the Best Online Rate.