Travefy - The easiest online and mobile group travel planner!
Roundcube - Web-based IMAP email client
ClientBase - Travel Agency
Mailpile - Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
Unit4 for Travel - Gain efficiency, live change and increase profitability with end-to-end ERP for travel management companies. Learn more about Unit4 for Travel.
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.