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Hosted email design with independent saved blocks, synced sections and export controls

Use a Vim-based editor with Lua configuration, a documented API, and remote-procedure-call support for extensions.

Connect one application to email accounts across major providers through a normalized API and webhook workflow.

A free Windows programmer’s editor with project workspaces, macros, FTP, HTML preview and a hex editor.

A compact programmer's editor with both graphical and terminal interfaces and Lua-based customization.

Email campaigns and triggered scenarios with an integrated content editor

Interactive email campaigns with AMP forms, journeys and fallback content

Test email and SMS workflows by routing app-generated messages to controllable inboxes and numbers.

Email API with delivery events and a shared usage balance

Collaborative email design with workspace-specific brands, approvals and export connectors

EU-hosted team chat with passwordless access, calls, and open-source clients.

AI email tool that writes and designs emails for Klaviyo.

A Java-based programmer’s editor with syntax modes, split views and an in-editor plugin manager.

Email campaigns, automations and transactional templates billed by sends

Edit a project across Windows, macOS, Linux, or the browser, with an extensible editor and integrated tools.

Edit source files with a lightweight cross-platform editor and optional Python add-ons.

A modal, configurable text editor for programming and general text work.

A native macOS code editor with project tools, Git integration, and an extension system under active development.

Email diagnostics with separate spam, seed-placement and visual-preview test allowances

AWS email sending and receiving with region-specific production access

Hosted email delivery with sender-domain setup, templates and message records

Transactional email, campaign broadcasts and event-triggered workflows in one platform

Email and SMS campaigns with editor reuse and several billing routes

Free no-signup email tools and guides for email marketers.