Framadate - Make your polls
Rezdy - Tour operators in 73 countries use Rezdy's booking software to sell thousands of products in real-time on their website and through distribution channels.
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
TravelBooster - Travel Booster - Travel Agent and TMC, Airline vacation companies, and Tour operator software with a complete suite of front, mid & back office tools.
Dudle - Dudle is an online scheduling application, which is free and open source.
Eventric - Eventric is an professional tour management solution.