Open source alternatives to Nitrosend

By GitHub stars it is Plunk, with 5,605 stars and a commit on 13 Nov. Choose Plunk when you want transactional email, campaigns and workflows on one list, with the option to run the same code on Amazon SES. Next come useSend (4,804 stars) and MailCheap (1,687 stars).

Yes. The code of all 3 is public under 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 Nitrosend for. Choose MailCheap when you run a newsletter from an AI agent and want each issue on its own web page, in code you can host. Choose useSend when you mostly send transactional email from code and want Amazon SES costs, with a dashboard you can host yourself.

All 3: Plunk, useSend and MailCheap. Each tool's page says what it needs to run.

All 3 we track had a commit in the last 30 days, among them Plunk, useSend and MailCheap. A recent commit shows the project is kept up, not that it will stay that way.

AGPL 3.0 (3). 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. Nitrosend'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.