There’s an introductory Scheme programming book called Simply Scheme that is available online for free. I wanted to brush up on my Scheme recently as part of writing my own implementation of the language in Haskell. However, the book is only available as html or as pdfs of the chapters. Whi …

Is there a nice way to split a multi-page PDF into its constituent pages? Its a question that comes up more often than you would think. Of course you could point some proprietary software at it, or you could do the job by hand. But there is a lovely free software way to do it, so you would be sor …