Open source alternatives to ActiveCampaign

By GitHub stars it is Mautic, with 10,986 stars and a commit on 13 Nov. Choose Mautic when you need drag-and-drop automation journeys and lead scoring but want contact data kept in your own database. Next come Plunk (5,605 stars).

Yes. The code of all 2 is public under GPL 3.0 or later or AGPL 3.0, so you can use them with no licence fee. Running one yourself costs the server and your time to look after it, and some makers also sell a hosted plan.

Start from the job you use ActiveCampaign for. Choose Plunk when your onboarding emails start from events in your own app and you would rather pay per email than per contact.

All 2: Mautic and Plunk. Each tool's page says what it needs to run.

All 2 we track had a commit in the last 30 days, among them Mautic and Plunk. A recent commit shows the project is kept up, not that it will stay that way.

GPL 3.0 or later (1), AGPL 3.0 (1). GPL and AGPL ask you to share your changes under the same licence when you give the software to others, and AGPL also counts letting people use it over a network.

The hosting. ActiveCampaign's maker runs the servers for you; with an open source tool the updates, backups, security fixes and support are yours, unless you take the maker's hosted plan. Features differ too, so check what each one imports and exports before you move your data.