Elegant Notification Popup JavaScript Library – Notiflix
Notiflix is a flexible, powerful and customizable notification popup library which sends different types of notification messages to the user.
JavaScript & CSS alert
Custom Alert/Confirm/Prompt Popup Box JavaScript Library – attention.js
attention.js is a vanilla JavaScript plugin used for creating custom alert, confirm or prompt dialog boxes on the page.
Vanilla JavaScript Alert/Confirm Modal Dialog Library – Modal.js
Modal.js is a vanilla JavaScript library for creating highly customizable alert and/or confirmation dialog boxes using plain JavaScript.
Clean Alert/Confirm Dialog In JavaScript – Modal.js
Modal.js is a configurable JavaScript popup box library for creating customizable, modal-style alert and confirmation dialog boxes on the webpage.
Pretty Clean Alert Notification Library – Allert.js
A minimal, clean notification JavaScript library for displaying toast-like alert messages on the web app.
Modern Material Design Dialog Generator In Pure JavaScript – duDialog
duDialog is a pure JavaScript plugin for creating Material Design inspired alert, confirmation, selection dialog popups without any dependencies.
Pretty Non-blocking Dialog Popup JavaScript Plugin – Prompt-Boxes
The Prompt-Boxes JavaScript plugin used to create nice, clean alert/confirm/prompt dialog boxes and toast-like notification popups on your web app.
Simple Customizable Modal Dialog JavaScript Plugin – popupmodal.js
popupmodal.js is a vanilla JavaScript plugin helps you create responsive, customizable modal dialog popups with ease.
Beautiful Native Javascript Alert Replacement – Sweet Alert
Sweet Alert is a pretty and highly customizable JS modal dialog library to replace the native Javascript alert, confirm and prompt dialogs.
Powerful Dialog & Popup JavaScript Library – dndod
dndod is a dependency-free JavaScript library that helps you create flexible, customizable alert/confirm dialogs, notification popups, and modal windows.