Foxit PDF Technology Chosen for Google Open-Source
"PDFium provides developers the opportunity to leverage a standards-compliant and high performance PDF open-source software library to view, search, print, and form fill PDF documents and PDF forms. And Google has turned to Foxit’s PDF technology to supply the open source PDF rendering engine for this project. Developers can use PDFium to deliver content via PDF files to users regardless of their computing platform or device."
Foxit is still selling PDF SDK.
The Best PDF SDK | Foxit PDF Library SDK
Google has PDF viewer and "print to PDF" features
integrated into Chrome web browser,
that is based on open source project Chromium.
Interesting dual-license deal for Foxit...
automation - How to Print to Save as PDF from a command line with Chrome or Chromium - Super User