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 confirm
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.
20 Modal Dialog Appearance Effects – xdialog
xdialog is a JavaScript library to create modern alert/confirm modal popups with 20 cool appearance effects using CSS3 transitions and transforms.
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.
Inline Confirmation Button Component In Pure JavaScript
A pure JavaScript component which applies an inline confirmation experience to an action button you specify.
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.
Promise Confirmation Dialog In Pure JavaScript – ExConfirmBox
ExConfirmBox is a lightweight, zero-dependency JavaScript plugin to create custom promise confirmation dialogs on the webpage.
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.
Multi Purpose Dialog Library In JavaScript (ES 6) – Dialog.js
Dialog.js is a pure JavaScript plugin for creating modern, easy-to-style dialog boxes using HTML dialog element.