...Basic browsing and lots of other functionalities, such as encryption, reading a document, verification of digital signatures, editing of annotations, searching for text using regular expressions, drawing pages into an image, and much more. Several plug-ins are available.
Gerber2PDF is a command-line tool to convert Gerber files to PDF for proofing and hobbyist printing purposes.
It converts multiple Gerber files at once, placing the resulting layers each on it's own page within the PDF. Each layer has a PDF bookmark for easy reference.
Layers can optionally be combined onto a single page and rendered with custom colours and transparency.
There is a Drill to Gerber converter available from the downloads page.
...On windows create a folder build/ beside src/ directory. PDF v1.7 support. Decrypt encrypted PDFs. Join or Split PDFs. Scale to any paper size, with specified margin. Write Page numbers. Write text and transform pages (rotate, flip, move). Booklet format arrange. 2 or 4 pages per page (2-up, 4-up). More readable output syntax for easy debugging.