Simple, lightweight, and heavily customizable.
Features:
Official library website: https://imask.js.org/
GitHub page: https://github.com/uNmAnNeR/imaskjs
Library version used: 6.4.2
Library license: MIT
Opted to add the imask library reference using the "AddJavaScriptTag" action from the "HTTPRequestHandler" extension instead of using an expression with escaped content.