OSI-licensed only · self-hostable
Segment is a customer data platform: collect events once, then route them to analytics, marketing and warehouse tools. It is a proprietary hosted product priced by tracked users. Open-source options cover its jobs in pieces: event collection and routing, reverse ETL, and the analytics destinations themselves.
Every tool below is under an OSI-approved licence (MIT, Apache-2.0, AGPL-3.0 or GPL-3.0-or-later), checked against its repository. RudderStack, Snowplow and Tracardi are often called open source but use source-available terms, so they are listed separately at the end.
Licences checked against each repository on November 7, 2026.
| Tool | Best for | Licence | Runs as |
|---|---|---|---|
| Jitsu | Closest Segment replacement for event collection | MIT | Docker |
| PostHog | Analytics with events, replays and flags | MIT | Docker |
| Apache Unomi | A customer profile backend | Apache-2.0 | Server |
| Dittofeed | Event-driven messaging journeys | MIT | Docker |
| Multiwoven | Reverse ETL from your warehouse | AGPL-3.0 | Docker |
| Matomo | Self-hosted web analytics | GPL-3.0-or-later | Server |
Best for: Closest Segment replacement for event collection
An open-source event data platform whose README calls it an alternative to Segment. Collects events and sends them to warehouses and other destinations.
Best for: Analytics with events, replays and flags
A platform for building products with analytics, session replay and feature flags. The ee directory carries a separate licence.
Best for: A customer profile backend
Stores user profile information and is mostly used as a backend for A/B testing and personalisation.
Best for: Event-driven messaging journeys
A self-hostable platform for sending messages to users across email, SMS, push and chat using broadcasts or event-driven journeys.
Best for: Reverse ETL from your warehouse
An open-source reverse ETL and data activation platform that syncs data from warehouses to business tools.
Best for: Self-hosted web analytics
The leading free and libre open analytics platform, a self-hosted alternative to hosted analytics tools.
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| If you need… | Start with |
|---|---|
| Replace Segment's event pipeline | Jitsu |
| Analytics plus replays and flags | PostHog |
| A profile and personalisation backend | Apache Unomi |
| Triggered email and messaging | Dittofeed |
| Push warehouse data to business tools | Multiwoven |
| Web analytics you fully own | Matomo |
Public source code, but under licences the Open Source Initiative doesn't approve. Fine to use; read the terms first.
The server repository states it is released under the Elastic License 2.0, which is source-available and not OSI-approved.
From January 2024 newer core pipeline versions moved to the Snowplow Limited Use License Agreement, which is not an OSI-approved licence.
Public source, but the Commons Clause restricts selling the software, so it is not OSI open source.
Quick answers to common questions
Jitsu is the closest, and its README describes it as an alternative to Segment. No single tool covers every Segment feature, so you may combine several.
Its server repository is released under the Elastic License 2.0, which is not an OSI-approved open-source licence.
Snowplow's repository states that since January 2024 newer core pipeline versions use the Snowplow Limited Use License Agreement.
Not automatically. Check each tool's destination list and expect to rebuild some integrations.
It syncs data from your warehouse back into tools such as CRMs. Multiwoven focuses on this job.
List it on TechLogHub and we'll review it for this page.
