Download of PDFLight 1.3.9803 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This free Mac application was originally produced by DALIM SOFTWARE GmbH. The software lies within Productivity Tools, more precisely Office Tools.
From the developer:
PDFLight is a PDF optimization utility for Mac users. The program allows you to optimize your PDFs for web and mobile and drastically reduce their file size for emailing. The program features fast conversions, high quality display of graphics and text, and more.
You may want to check out more software for Mac, such as PDFMergeThing or iTeXMac2, which might be related to PDFLight.