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  1. 985

    Resend

    Developer-first email API — transactional emails, React email templates, deliverability built in

    resend.comFreemium4mo ago

    Developer Tools

  2. 1375

    AgentMail

    AgentMail provides email inbox APIs specifically designed for AI agents, allowing them to create, manage, and operate email inboxes for two-way communication. It enables AI agents to receive emails, extract information like 2FA codes, handle customer service inquiries, and participate in email conversations just like humans.

    www.agentmail.toFreemium5mo ago

    @agentmail-to · AI Agents

  3. 972

    SendGrid

    Twilio's email API — transactional and marketing email at scale.

    sendgrid.comFreemium3mo ago

    Developer Tools

  4. 933

    Mailgun

    Transactional email service. Transactional email API with deliverability tooling, inbound routing, and email validation. Now part of Sinch.

    www.mailgun.comPaid7d ago

    Developer Tools

  5. 1783

    brrr

    A minimalist push notification service for iOS and macOS that lets you send yourself custom notifications via a simple webhook. Perfect for build alerts, reminders, and personal notifications without accounts or data storage.

    brrr.nowPaid3mo ago

    @simonbs · Developer Tools

  6. 1293

    Linq

    Linq provides enterprise-grade messaging APIs that enable businesses to build conversational experiences using native iMessage, RCS, SMS, and voice protocols. It allows developers to integrate rich messaging features like emoji reactions, voice notes, and group chats directly into their applications without requiring users to download separate apps.

    linqapp.comPaid4mo ago

    @elliott__potter · Developer Tools

  7. 949

    AWS SES

    Cheap email sending on AWS. AWS's email service for transactional and marketing email. Cheapest per-email pricing on the market but you handle deliverability tooling yourself.

    aws.amazon.comPaid7d ago

    Developer Tools

  8. 1509

    Agent Inbox

    Give any AI agent a disposable email inbox in one tool call. MCP server for email verification, auth flows, and testing.

    https://github.com/gsd-build/agent-inboxOpen Source2mo ago

    gsd-build · AI Agents

  9. 1730

    AgentMail

    A messaging service that enables direct AI-to-AI communication through temporary channels. Provides unique URLs that AI agents can use to exchange messages with each other, with channels expiring in 24 hours and messages in 1 hour.

    say-hi.toFree3mo ago

    @EastlondonDev · AI Agents

  10. 429

    Resend MCP Server

    Send email from your agent over MCP. Official MCP server for Resend — send transactional email, read inbound mail, and manage contacts, broadcasts, and domains from any MCP client like Claude, Cursor, or Claude Code. Remote OAuth server (mcp.resend.com) or local npx server with a Resend API key.

    github.com/resend/resend-mcpOpen Source1mo ago

    resend · Developer Tools

  11. 1285

    Poke

    A proactive AI assistant that transforms your emails into actionable tasks and helps you manage communications across different messaging channels. Currently experiencing service disruptions on WhatsApp due to Meta's antitrust investigation.

    poke.comFreemium5mo ago

    AI Agents

  12. 1760

    Actors

    Infrastructure platform that gives autonomous AI agents their own email addresses, mailboxes, and communication tools. Enables agents to send emails, make phone calls, and receive webhooks independently without borrowing their owner's credentials.

    actors.devFreemium5mo ago

    @r00k · AI Agents

  13. 556

    Loops

    Email platform built for SaaS. Email marketing and transactional email platform designed for SaaS companies. One plan with full feature access, pricing scales by contact count.

    loops.soPaid7d ago

    Developer Tools

  14. 406

    agmsg

    agmsg is a cross-vendor messaging system that lets CLI AI coding agents (Claude Code, Codex, Gemini CLI, GitHub Copilot) communicate directly with each other through a shared local SQLite database. It eliminates the need for humans to manually copy-paste between agents, enabling multi-agent collaboration without any daemon, server, or complex infrastructure — just bash and SQLite.

    github.com/fujibee/agmsgOpen Source27d ago

    @izutorishima · AI Agents

  15. 1453

    gmcli

    Minimal Gmail CLI — read, search, send, and triage your inbox from the terminal without the Gmail web UI.

    https://github.com/badlogic/gmcliOpen Source2mo ago

    badlogic · Productivity

  16. 275

    Postmark

    Reliable transactional email. Transactional email service known for fast delivery and high inbox placement. Separate streams for transactional and broadcast.

    postmarkapp.comPaid7d ago

    Developer Tools

  17. 542

    Open-Dispatch

    Open-Dispatch is a self-hostable API and dashboard that dispatches a single content payload to seven social platforms — Twitter/X, Instagram, Telegram, Bluesky, LinkedIn, Threads, and YouTube Shorts — via one HTTP call. It offers a queue with retry/error visibility, an AI caption-adaptation endpoint, and an MCP server, positioning itself as a free MIT-licensed alternative to paid schedulers like Buffer or Hootsuite.

    github.com/matthew-selvam/open-dispatchOpen Source6d ago

    matthew-selvam · Developer Tools

  18. 784

    imsg

    A command-line tool for macOS that allows programmatic access to Apple's Messages.app to send, receive, and stream iMessages and SMS. Enables automation and AI agents to interact with Messages without using private APIs.

    github.com/steipete/imsgOpen Source3mo ago

    @steipete · Developer Tools

  19. 632

    Zulip

    Threaded team chat (open source). Open-source team chat organized around topics for async-friendly threading. Free to self-host; Cloud Standard is per-user.

    zulip.comFreemium7d ago

    Developer Tools

  20. 935

    Webex

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

    www.webex.comFreemium7d ago

    Developer Tools

  21. 300

    Listmonk

    Self-hosted newsletter and mailing list manager. Single binary, fast, multi-language.

    listmonk.appOpen Source3mo ago

    knadh · Developer Tools

  22. 201

    Telegram

    Messaging with channels & bots. Fast messaging with large group channels and a strong bot API. Free to use; Premium is a per-person upgrade.

    telegram.orgFreemium7d ago

    Developer Tools

  23. 571

    Alertmanager

    Alert routing & silencing. The Prometheus project's alert handler — deduplicates, groups, and routes alerts to email, Slack, PagerDuty, and more, with silences and inhibition.

    prometheus.ioOpen Source7d ago

    Developer Tools

  24. 176

    Slack

    Team chat and channels. Channel-based team messaging with threads, huddles, and a deep app/integration directory. The default team chat for most startups.

    slack.comFreemium7d ago

    Developer Tools

  25. 625

    Mailchimp

    Email marketing and automation. Email marketing platform with audience management, campaign builder, automations, and analytics. Popular for newsletters and drip campaigns.

    mailchimp.comPaid7d ago

    Developer Tools

  26. 250

    Discord

    Community servers, voice & chat. Server-based chat, voice, and video popular for developer and product communities. Free to run; Nitro is a per-person upgrade.

    discord.comFreemium7d ago

    Developer Tools

  27. 1504

    FoundationChat

    Dimillian's chat app powered by iOS 26 Foundation Models — runs Apple's on-device LLM with no cloud round-trips.

    github.com/dimillian/foundationchatOpen Source2mo ago

    dimillian · AI Tools

  28. 583

    Mattermost

    Self-hostable team chat. Open-source, self-hostable Slack alternative. Free to self-host; the paid Professional tier adds SSO, compliance, and support.

    mattermost.comFreemium7d ago

    Developer Tools

28 results

Ranked by a proprietary index. Your upvotes inform it; the ranking itself is ours. Corrections welcome.