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Open-source webhook infrastructure for growing SaaS teams. Inbound and outbound webhooks with Standard Webhooks signing, configurable retries, and a dashboard. From $49/mo. | The headless form backend built for developers and designers. Create forms your way, host anywhere. Get validation, webhooks, email notifications, and more with zero backend code. |
Outbound webhook delivery, Inbound webhook reception, Standard Webhooks signing (HMAC-SHA256), Configurable retries with exponential backoff, Circuit breakers, Dead letter queue with replay, Real-time dashboard, Payload transformation, Multi-tenant (PostgreSQL RLS), TypeScript SDK, API-first (no browser required), Open source (AGPL-3.0) | Headless Form Backend |
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Mandrill is a new way for apps to send transactional email. It runs on the delivery infrastructure that powers MailChimp.

Twilio SendGrid's cloud-based email infrastructure relieves businesses of the cost and complexity of maintaining custom email systems. Twilio SendGrid provides reliable delivery, scalability & real-time analytics along with flexible API's.
Mailgun is a set of powerful APIs that allow you to send, receive, track and store email effortlessly.

Sidekiq uses threads to handle many jobs at the same time in the same process. It does not require Rails but will integrate tightly with Rails 3/4 to make background processing dead simple.

Amazon SES eliminates the complexity and expense of building an in-house email solution or licensing, installing, and operating a third-party email service. The service integrates with other AWS services, making it easy to send emails from applications being hosted on services such as Amazon EC2.

Beanstalks's interface is generic, but was originally designed for reducing the latency of page views in high-volume web applications by running time-consuming tasks asynchronously.

Send email from your app with a simple API call, Sendwithus manages the rest. Templates, testing, data management, segments, and analytics are all accessible through a friendly dashboard.

Postmark removes the headaches of delivering and parsing email for webapps with minimal setup time and zero maintenance.

Build beautiful and engaging next-generation online forms, surveys, quizzes, landing pages, and much more with Typeform

Mailjet is a real-time Cloud Emailing platform: scalable, agile and flexible. Our unique algorithm boosts your deliverability and our platform provides in-depth insight so you can optimize more than ever.