Open source alternatives to GetResponse

By GitHub stars it is listmonk, with 24,288 stars and a commit on 12 Nov. Choose listmonk when you want to email large lists through your own SMTP provider, with no price that grows with your contact count. Next come BillionMail (16,280 stars) and Mautic (10,986 stars).

Yes. The code of all 6 is public under AGPL 3.0, GPL 3.0 or later, AGPL 3.0 or later or MIT, 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 GetResponse for. Choose BillionMail when you want to send unlimited campaigns from your own mail server instead of paying by contact count. Choose Hyvor Post when you only send newsletters and want one price by monthly emails, with unlimited team members on every tier.

5 of the 6: listmonk, BillionMail, Mautic, Keila and SendPortal. Each tool's page says what it needs to run.

5 of the 6 we track had a commit in the last 30 days, among them listmonk, Mautic, Keila and SendPortal. The quietest is BillionMail, last changed on 11 Jun. A recent commit shows the project is kept up, not that it will stay that way.

AGPL 3.0 (3), GPL 3.0 or later (1), AGPL 3.0 or later (1), MIT (1). MIT, BSD and Apache let you change and reuse the code freely. 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. GetResponse'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.