Not open-source (as you have to initially pay for a license), but it is self-hosted: you can try out my analytics platform[0] as it has an A/B testing feature a

Not open-source (as you have to initially pay for a license), but it is self-hosted: you can try out my analytics platform[0] as it has an A/B testing feature and you can always implement your own A/B versions and just track stats for each of them. Let me know if you have any questions or concerns about userTrack! [0]: https://www.usertrack.net https://www.usertrack.net