Novu - The ultimate library for managing multi-channel transactional notifications with a single API.
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Courier - Courier is a notification API built for developers. Design once, and deliver to any channel – email, Slack, SMS, push, and more – all through a single API.
Materialize CSS - A modern responsive front-end framework based on Material Design
Sweego.io - Send all your notifications (email, SMS, slack, chat…) and make sure that they’re delivered. Create, send and monitor easily with Sweego for developers.
Purecss - A set of small, responsive CSS modules that you can use in every web project.