Pumble

Pumble is a free business messaging and work communication app that allows you to:
• Send direct and group messages to teammates
• Create public and private channels to organize and discuss work topics
• Create meeting links where you can talk to others
• Have unlimited access to history of all your messages
• Invite an unlimited number of users
• Send audio and video messages
• Upload and share files and links
• Available across devices (mobile, desktop, web)

Learn more: https://pumble.com