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  1. 436

    Resend

    Developer-focused email API for transactional mail, with React email templates and built-in deliverability.

    Serviceresend.comFreemium

    @resend · Developer Tools

  2. 1347

    eusend

    eusend is a developer-first transactional email and broadcast API with all sending infrastructure hosted in the EU, aimed at businesses needing data residency compliance. It offers official SDKs for Node.js, Python, and Go, built-in React Email template rendering, DKIM domain verification, and webhook-based delivery/open/click tracking.

    Serviceeusend.dev

    Developer Tools

  3. 1182

    AgentMail

    Email inbox API built for AI agents, letting them create inboxes, receive mail, and extract 2FA codes.

    Servicewww.agentmail.toFreemium

    @agentmail-to · AI Agents

  4. 2326

    DearAgent

    Gives AI agents their own self-hosted email inbox on Cloudflare, with an MCP server included.

    github.com/panda-sandeep/dearagentOpen Source

    Developer Tools

  5. 471

    SendGrid

    Email API from Twilio for delivering transactional and marketing messages at scale.

    Servicesendgrid.comFreemium

    Developer Tools

  6. 1198

    Emailclaw

    A local-first AI agent that treats each email thread's subject line as an isolated project with its own workspace.

    Agentgithub.com/emailclaw/emailclawOpen Source

    AI Agents

  7. 2022

    Mailgun

    Transactional email API offering deliverability tooling, inbound message routing, and address validation.

    Servicewww.mailgun.comPaid

    @Mail_Gun · Developer Tools

  8. 1868

    brrr

    Push notification service for iOS and macOS that sends custom alerts to yourself via a simple webhook.

    Servicebrrr.nowPaid

    @simonbs · Developer Tools

  9. 1087

    Linq

    Messaging APIs that let businesses build conversational experiences over native iMessage, RCS, SMS, and voice.

    Servicelinqapp.comPaid

    @elliott__potter · Developer Tools

  10. 2041

    AWS SES

    AWS email service for transactional and marketing sending where you handle deliverability tooling yourself.

    Serviceaws.amazon.comPaid

    @awscloud · Developer Tools

  11. 1637

    Agent Inbox

    MCP server that hands AI agents disposable email inboxes for verification, auth flows, and testing.

    MCP Serverhttps://github.com/gsd-build/agent-inboxOpen Source

    gsd-build · AI Agents

  12. 1824

    AgentMail

    Messaging service where AI agents exchange messages over temporary channels that expire within 24 hours.

    Servicesay-hi.toFree

    @EastlondonDev · AI Agents

  13. 956

    Resend MCP Server

    Official MCP server for sending transactional email and managing contacts, broadcasts, and domains through Resend.

    MCP Servergithub.com/resend/resend-mcpOpen Source

    resend · Developer Tools

  14. 2529

    openmsg

    Lets Claude Code, Codex, and OpenCode sessions send each other messages while running.

    github.com/marciob/openmsgOpen Source

    AI Agents

  15. 2847

    Pushie

    Sends push notifications to your devices via a single HTTP POST request, no app required.

    pushie.netFree

    Developer Tools

  16. 1080

    Poke

    Proactive assistant that turns emails into actionable tasks and manages communication across messaging channels.

    Agentpoke.comFreemium

    @interaction · AI Agents

  17. 1229

    Loops

    Email platform handling both marketing campaigns and transactional sends, designed around SaaS companies.

    Serviceloops.soPaid

    @loops · Developer Tools

  18. 901

    agmsg

    Messaging layer letting CLI coding agents from different vendors talk to each other via a shared local SQLite database.

    Utilitygithub.com/fujibee/agmsgOpen Source

    @izutorishima · AI Agents

  19. 1581

    gmcli

    Minimal Gmail CLI for reading, searching, sending, and triaging your inbox from the terminal.

    Utilityhttps://github.com/badlogic/gmcliOpen Source

    badlogic · Productivity

  20. 606

    Postmark

    Transactional email service with separate streams for transactional and broadcast mail, focused on inbox placement.

    Servicepostmarkapp.comPaid

    @postmarkapp · Developer Tools

  21. 2594

    MergeMe

    One updating Slack card per PR/MR with threaded comments, CI status, and stale-PR reminders.

    mergeme.dev

    Developer Tools

  22. 1141

    Open-Dispatch

    Self-hostable API and dashboard that posts one content payload to seven social platforms in a single HTTP call.

    Applicationgithub.com/matthew-selvam/open-dispatchOpen Source

    matthew-selvam · Developer Tools

  23. 614

    imsg

    macOS command-line tool that scripts Messages.app to send, receive, and stream iMessages and SMS for automation.

    Utilitygithub.com/steipete/imsgOpen Source

    @steipete · Developer Tools

  24. 724

    Zulip

    Open-source team chat organized around topics, giving conversations async-friendly threading.

    Applicationzulip.comFreemium

    zulip · Developer Tools

  25. 2027

    Webex

    Cisco's meetings, calling, and messaging suite aimed at larger organizations with compliance and calling needs.

    Applicationwww.webex.comFreemium

    Developer Tools

  26. 2173

    herdr-remote

    Monitor and control Herdr agents from desktop, phone, or Telegram.

    github.com/dcolinmorgan/herdr-remoteFree

    dcolinmorgan · Developer Tools

  27. 152

    Listmonk

    Self-hosted newsletter and mailing list manager that ships as a single Go binary with multi-language support.

    Applicationlistmonk.appOpen Source

    knadh · Developer Tools

  28. 553

    Telegram

    Messaging platform with large group channels and a bot API for building automated community tools.

    Applicationtelegram.orgFreemium

    @telegram · Developer Tools

  29. 787

    Alertmanager

    The Prometheus project's alert handler, deduplicating, grouping, and routing alerts to email, Slack, and PagerDuty.

    Serviceprometheus.ioOpen Source

    prometheus · Developer Tools

  30. 530

    Slack

    Channel-based team messaging with threads, huddles, and a deep directory of app integrations.

    Applicationslack.comFreemium

    @slackhq · Developer Tools