Mattermost - Mattermost is an open source alternative to Slack.
GetYourGuide - Get tickets to the most popular attractions while travelling
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Klook - Discover & book amazing experiences at exclusive prices
Slack - A messaging app for teams who see through the Earth!
Airbnb - Book unique places to stay and things to do.