HomeAway

About: 

HomAway is the world’s #1 choice for holiday homes, they connect property owners and managers with holidaymakers looking for the perfect accommodation to share their dream holidays together with families and friends.

Integration: 

HomeAway is a two-way integration, meaning you can synchronise your calendars with other parties to reflect the same availability using iCal.

NB: iCal based integrations are not real-time and carry a small delay in availability updates from showing.