A free app for Android, by Bitrix.

Bitrix24 is a business communication and collaboration platform with CRM elements. It is built on a foundation of intuitive, easy-to-use technology that allows you to connect, collaborate, and communicate in real time with your contacts, regardless of their location or platform.

Bitrix24 provides a complete solution for modern business communication. It combines a CRM with chat, email, and video into a single, intuitive interface. The platform is built to empower your team and help them to achieve their goals.

The platform is built to empower your team and help them to achieve their goals. You can add contacts from your CRM and send them to any chat, email, or video session. You can also see all of your chats, whether they are personal or group.