Mattermost - Mattermost is an open source alternative to Slack.
Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
KAYAK - KAYAK is a travel search engine that searches hundreds of other travel sites at once. Our helpful tools & features find you the information you need to make the right decisions on flights, hotels, rental cars and vacation packages.
Slack - A messaging app for teams who see through the Earth!
Momondo - Find cheap flights with Momondo.