Pumble

Pumble is team communication software that allows teams to communicate using one-on-one direct messages, group chats, 1:1 video and audio calls, screen and file sharing, as well as public and private channels. The interface is quite practical and easy to use.

Pumble is also great Slack alternative due to outstanding features in free plan, such as 10 GB file storage, unlimited users and unlimited chat history. Plus in paid plan there is a self-hosting option for maximum security and privacy. The best fit? Small and medium businesses, startups and non-profit organisations.