One for the coders: I discovered CodeRunner by Nikolai Krill a few months back, and it’s proven to be very, very useful in the kind of work that I do. It allows you to test blocks of code and see the results quickly and easily. It has syntax highlighting and autocompletion, as well as the ability to handle a wide variety of languages.
This is a companion discussion topic for the original entry at https://brettterpstra.com/2011/10/28/app-review-coderunner