License: AGPL While not a direct Bitrix24 clone, Nextcloud Hub does something unique: It combines file sync (like Dropbox) with collaboration (OnlyOffice/Collective) and basic CRM (via Nextcloud Tables or integrations).

License: GPLv3 If you love Bitrix24’s modern interface but hate the proprietary lock-in, look at EspoCRM. It is clean, fast, and responsive.

To be considered open source by the Open Source Definition (OSI), a license must permit:

Bitrix24’s license (both cloud and on-premise) fails these criteria because:

Before jumping to alternatives, ask yourself why you searched for "Bitrix24 open source." Usually, it is one of three reasons:

| Your Goal | Does Bitrix24 do this? | The Solution | | :--- | :--- | :--- | | 1. I have zero budget. | No. Self-hosted licenses are expensive. Cloud free tier is limited to 12 users. | Switch to a truly free open-source suite (see below). | | 2. I want full code control to customize everything. | No. You cannot touch the core PHP. | Switch to a GPL-licensed platform. | | 3. I don't trust cloud vendors with my customer data. | Yes. The self-hosted version solves this (for a fee). Open source would also solve this. | You have two paths: Pay for Bitrix24 On-Prem, or switch to open source. |

If reason #3 is your only concern, you might simply buy the self-hosted license. But if reasons #1 or #2 are your drivers, you need to look elsewhere.

Before Bitrix24, there was Bitrix Site Manager (later 1C-Bitrix). In its early versions (circa 2008–2012), parts of the framework were distributed under a limited open source license (though never fully GPL/MIT). That legacy product is not Bitrix24.

License: GPLv3 SuiteCRM is a fork of the once-famous SugarCRM. It is the most feature-rich open-source CRM on the market.