Open Source: Bitrix24

Here are genuine open source alternatives to Bitrix24 (self-hosted, full control):

| Platform | License | Features similar to Bitrix24 | |----------|---------|-------------------------------| | Odoo Community | LGPL | CRM, project management, document sharing, live chat | | SuiteCRM | AGPLv3 | Full CRM + email marketing + reporting | | Dolibarr | GPLv3 | ERP/CRM, invoicing, HR, with open code | | OnlyOffice + Nextcloud | AGPLv3 (OnlyOffice) + AGPL (Nextcloud) | Docs, collaboration, project management, drive | | Leantime | AGPLv3 | Lean project management + ideation + time tracking |

If you specifically need task + CRM + chat + document all in one open source stack: Odoo Community or SuiteCRM + Rocket.Chat comes closest. bitrix24 open source

Let’s get this out of the way immediately. There is no official "open source" version of Bitrix24.

The software is proprietary, commercially licensed software. The source code is owned exclusively by Bitrix, Inc. You are legally prohibited from modifying the core code, removing copyright notices, or redistributing it.

If you find a website offering "Bitrix24 Open Source Download," it is either: | Feature | Bitrix24 (Self-Hosted) | Odoo (CE)

Bitrix24 operates on two models:

| Aspect | Pros (The Good) | Cons (The Bad) | | :--- | :--- | :--- | | Code Access | Full access to business logic and UI templates. Deep customization is possible. | Encrypted kernel limits deep debugging. Mixing of legacy and modern PHP code makes development messy. | | Cost | Self-hosted gives you data sovereignty (no monthly SaaS rent if you stay on the free tier). | Requires expensive server infrastructure and maintenance time. License costs for >12 users are significant. | | Integration | Native integration between CRM, Site, and Chat is seamless. | API rate limits can be restrictive. The push toward REST makes local development clunky. | | Ecosystem | Huge marketplace of add-ons (mostly Russian/Eastern European developers). | Quality of marketplace apps varies wildly. Documentation can be spotty or poorly translated from Russian. |

License: LGPL Odoo is the closest 1:1 alternative to Bitrix24. The Community Edition covers CRM, Sales, Project Management, Inventory, Accounting, and Website building. Here are genuine open source alternatives to Bitrix24

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

It is critical to immediately address the terminology regarding Bitrix24’s licensing to avoid legal and operational misunderstandings.

First, let's clear the air. Bitrix24 is not Open Source in the Stallman-esque sense (like GPL or MIT). You cannot legally fork the entire platform and sell it as "Bob’s CRM" without repercussions.

However, Bitrix24 offers a Self-Hosted version (formerly Bitrix24 Intranet) that gives you full access to the server-side PHP source code. This is "Source Available." You can modify it, audit it, and run it on your own servers forever without paying a monthly per-user fee (after the initial license purchase).

For the developers and sysadmins reading this, that distinction matters less than you think. What matters is: Can I change the report logic at 2 AM without waiting for an API ticket? Yes. Yes, you can.