juspay / hyperswitch

Open-source, self-hostable payments infrastructure in Rust that connects to many payment processors and offers routing, vault, and reconciliation modules.

dotnet / aspnetcore

Cross-platform .NET framework for building cloud-connected web, IoT, and mobile backend applications.

PHPMailer / PHPMailer

A PHP library for composing and sending email with SMTP, attachments, HTML bodies, and address validation.

danog / MadelineProto

Async PHP library implementing the Telegram MTProto protocol client API, for logging in as a user or bot without the Bot API.