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.
Swift Mailer : Swift Mailer integrates into any web app written in PHP 5, offering a flexible and elegant object-oriented approach to sending emails with a multitude...
jsPDF : A HTML5 client-side solution for generating PDFs. Perfect for event tickets, reports, certificates, you name it!
Pimple : Pimple is a small Dependency Injection Container for PHP 5.3 that consists of just one file and one class (about 50 lines of code).
TCPDF is a FLOSS PHP class for generating PDF documents.