HTML Purifier : HTML Purifier is a standards-compliant HTML filter library written in PHP. HTML Purifier will not only remove all malicious code (better known as XSS)...
HTML2PDF : HTML2PDF is a HTML to PDF converter written in PHP.
It allows the conversion of valid HTML 4.01 in PDF format, and is distributed under OSL.
TCPDF : TCPDF is a FLOSS PHP class for generating PDF documents.
Text_Highlighter : Provides functionality to perform syntax highlighting for different file formats.
Parsley.js : Javascript forms validation.
Powerful, UX aware & Dead simple.
This PHP package provides methods to create, validate and render HTML forms.