Pumble

Pumble is a team messaging and business communication app for companies that need a central place for chat, files, and calls across Web, Desktop, Android, and iOS.

Key capabilities include:

• Unlimited users and unlimited message history on the free plan, plus direct messages, group messages, and private/public channels
• Threads, mentions, reactions, and notification controls to keep conversations organized
• File sharing with 10GB storage per workspace on the free plan
• Voice and video messages and 1:1 voice/video calls in the free tier; paid plans add group meetings (up to 100 members), screen sharing, and meeting recordings

Pricing: Freemium with Free ($0), PRO ($2.49/user/month annual, $2.99 monthly), Business ($3.99/user/month annual, $4.99 monthly), and Enterprise ($6.99/user/month annual, $7.99 monthly).

What makes it notable is its generous free limits (unlimited users and chat history), free Slack import, and clear per-user pricing for teams evaluating cost-effective alternatives to Slack and similar collaboration tools.