GNU sed is described as 'Sed (stream editor) is a Unix utility that parses text and implements a programming language which can apply transformations to such text. It reads input line by line (sequentially), applying the operation which has been specified via the command line (or a sed script), and then' and is an app in the office & productivity category. There are more than 10 alternatives to GNU sed for a variety of platforms, including Windows, Linux, Mac, BSD and iPad apps. The best GNU sed alternative is Perl, which is both free and Open Source. Other great apps like GNU sed are Find and Replace (FNR), Text Workflow, NimbleText and Gema.