RE: Server side Swift

Linux is second class citizen as far as Swift is concerned for sure. I had to jump through a few hoops to make sure my library works on both Linux and iOS.

Just tried v4.1 and everything compiled cleanly:

http://pdfjet.com/swift/PDFjet-Swift-2018-03-30.zip

BSD licensed code, 100% written in Swift (I went through the trouble of writing the compression code in Swift since the compression classes were missing from the Linux distribution and some older versions of iOS ) - give it a try.