When you’re doing documentation for code it helps if the app you’re using to document your code is easy to use and tailored for use with your programming language. For this purpose Plain Old Documentation, or pod. Perlpod, one of the more widely used implementations was ported and used to write Programming Perl, with O’Reilly and Higher-Order Perl. But what if you’re writing code in other languages? Well, Javadoc is a popular documentation tool for Java. Then there’s phpDocumentator, is a popular documentation tool for PHP. All are easy to implement and open source, so give them a whirl if it’s the kind of thing that tickles your fancy.