Bitrix24 is the world's only free unified communications software available both in the cloud and on-premise. And you get everything - enterprise social network, company instant messenger, telephony (PBX), video chat and video conferencing, email server, file sharing and project management. If something is used for communication and collaboration, chances are it's one of the 35+ free unified communication tools available inside Bitrix24. API, content management and open source code are all available.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.
For more information about Bitrix24, head over to our training courses. We also have a great YouTube channel that covers every aspect of Bitrix24, from sales and planning to document management and company internal communication tools. To download the self-hosted edition of Bitrix24 that can be installed on your own server and give you access to open source code, please visit the Bitrix24 Self-Hosted page.