Category
Sending, receiving, and orchestrating transactional and notification messages.
29 products, 22 Projects: 16 open source, 1 source-available, 5 unresolved-license
Marketing email, audiences, and campaign reporting
Mailchimp made email marketing approachable for people who are not marketers. The editor, the templates, and the reporting are all pitched at a small business owner rather than at a growth team.
Transactional and marketing email delivery
SendGrid handles the part of email nobody wants to own: reputation, authentication, bounce processing, and the endless negotiation with inbox providers about whether your mail is wanted.
Google's email client and the inbox most people mean
Gmail's search is still the reason to use it. Conversation threading, effectively unlimited retention on paid plans, and spam filtering that most self-hosted setups cannot match make it the default even for people uncomfortable with the arrangement.
APIs for SMS, voice, and verification at scale
Twilio turned telecommunications into an HTTP request, and the abstraction held. Sending a message to a phone anywhere in the world became a few lines of code rather than a carrier negotiation.
Screened, tracker-free email plus calendar from 37signals
HEY is a paid email and calendar service from 37signals that screens new senders, sorts mail into a focused Imbox, and blocks tracking pixels.
Multi-channel notification infrastructure for applications
Novu takes the notification logic that usually ends up scattered across a codebase - which channel, which template, which quiet hours, which digest window - and puts it behind one API and one workflow editor.
Marketing, lifecycle, and transactional email for SaaS teams
Loops is an email platform for SaaS teams that sends marketing, lifecycle, and transactional email from one product and API.
Self-hosted push notifications over simple HTTP PUT/POST
ntfy is a self-hosted push-notification service that sends alerts to phones and desktops with a simple HTTP PUT or POST to a topic, plus open-source Android, iOS, web, and CLI apps.
Email inbox API that gives every AI agent its own address
AgentMail is an API-first email service that gives AI agents their own inboxes to send, receive, and track messages programmatically.
Self-hosted newsletter and mailing list manager
Listmonk is a single Go binary and a Postgres database that handles subscriber lists, segmentation, campaigns, and bounce processing at a scale that would be expensive on a hosted platform.
Run your own mail server and email marketing from one dashboard
BillionMail combines a mail server with newsletter and campaign tooling in one self-hosted package. One Docker Compose file brings up the web console plus mail transfer, mailbox, spam-filtering, database, and cache services, so a team can send and receive mail and run bulk campaigns from infrastructure it controls.
Open-source AI email assistant that triages Gmail and Outlook
Inbox Zero is an open-source AI email assistant for Gmail and Outlook that triages mail, drafts replies, and automates follow-ups, available as paid hosted plans or self-hosted.
Open source marketing automation with email and campaigns
Mautic is a free, self-hosted marketing automation platform for email campaigns, lead scoring, and multi-channel customer journeys.
Open-source programmable voice and messaging platform
Fonoster is an open-source programmable telecommunications platform for voice and messaging, positioned as a self-hostable alternative to Twilio.
Encrypted email, calendar and contacts with open-source apps
Tuta is an end-to-end encrypted email service with calendar and contacts, offering open-source apps and hosted servers in Germany.
Open-source transactional and marketing email platform
Plunk is an open-source email platform that unifies transactional email, marketing campaigns, and automated workflows against one contact list.
Open-source email API with self-hosting
useSend is an open-source email platform with a developer API, contact management, and campaign tools, available as managed cloud or self-hosted with your own AWS SES keys.
Self-hostable customer engagement for automated lifecycle messaging
Dittofeed is a self-hostable customer engagement platform that automates marketing and transactional messages across email, SMS, webhooks, and mobile push.
Open-source drag-and-drop HTML email designer for AWS SES
Sendune is an open-source HTML email designer and AWS SES dashboard for contacts, campaigns, and delivery tracking through your own AWS account.
Self-hosted short links, temporary email, and file storage on your own domain
WR.DO is an open-source platform for short links, temporary email, file storage, and subdomain management on your own domain.
Self-hosted newsletters and transactional email
Notifuse is a self-hosted newsletter and transactional email platform with a visual MJML editor, contact timelines, and a transactional API, free to run.
Open-source newsletters, self-hosted or managed
Keila is an open-source newsletter platform with visual campaign editing, contact segmentation, and signup forms, available self-hosted or as managed EU cloud.
Self-hosted email marketing with campaigns and lists
SendPortal is a self-hosted email marketing app for subscriber lists, campaigns, and delivery reports. It connects to providers such as Amazon SES and SendGrid, and runs standalone or as a Laravel package.
29 results