Mattermost - Mattermost is an open source alternative to Slack.
FoodieTrip - Helping travelers eat like locals everywhere
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
2B LOCAL - Social travel & lifestyle app with tips by friends & locals
Slack - A messaging app for teams who see through the Earth!
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.