Wikipedia
Thymeleaf
Thymeleaf is a Java XML/ XHTML/ HTML5 template engine that can work both in web ( Servlet-based) and non-web environments. It is better suited for serving XHTML/HTML5 at the view layer of MVC-based web applications, but it can process any XML file even in offline environments. It provides full Spring Framework integration.
In web applications Thymeleaf aims to be a complete substitute for JSP, and implements the concept of Natural Templates: template files that can be directly opened in browsers and that still display correctly as web pages.
Thymeleaf is Open-Source Software, licensed under the Apache License 2.0.