jsoup

jsoup is a mature Java library for reading, extracting, and changing HTML from real websites. It builds a WHATWG HTML5 DOM so Java apps can work with messy web pages in a structured way.

Key Features:

• Real-World HTML Parsing - Handle HTML as it appears on live websites
• Standards-Based DOM - Parse pages into a WHATWG HTML5 document model
• CSS Selectors - Find elements with familiar selector syntax
• DOM Traversal - Navigate and update document structure in Java
• Open Source Under MIT - Java project with 11,369 GitHub stars