Bare Bones Software, bbsw@barebones.com, http://www.barebones.com/
Requirements: Mac OS X 10.3.5 or higher
BBEdit is still the best dang text editor you can get, and in the brave new world of Mac OS X. It’s more useful than ever, with a command-line tool and a mainline to the Unix shell built right in. This trial version gives you the whole enchilada for 30 days. Requirements: Mac OS 9.2.2 - OS X 10.2 or higher
Requirements: Mac OS X 10.2 or higher, Apple Xcode tools or Project Builder
BlitzMax is the new, next generation game programming language from Blitz Research. BlitzMax provides developers with a complete cross-platform 2D programming solution for OS X, Windows and Linux.
REALbasic OS X 5.5.4 demo
REAL Software, support@realsoftware.com, http://www.realsoftware.com
Requirements: G3 or faster Mac, Mac OS X 10.1 or later
If you’re looking to create cool looking applications but don’t want to learn confusing C++ or Java, REALbasic is definitely the way to go. This object-oriented developmental program features a visual interface builder for easy construction of windows and menus, and provides easy to understand syntax to get your creations up and running quickly. In fact, our own Tour interface was completely built using it. Create apps for Mac OS, Mac OS X, and Windows (ugh!).
Smultron 1.0.2 freeware
Peter Borg, http://smultron.sourceforge.net
Requirements: Mac OS X 10.3 or higher
Smultron is an open-source text editor written for Mac OS X Panther with many of the features that you might need. It features easy selection of the opened documents, line numbers, support for syntax colouring for many different languages, support for text encodings, code snippets, a toolbar, a status bar, HTML preview, multi-document find and replace with regular expressions, possibility to show invisible characters, authenticated saves, command-line utility, .Mac synchronisation of preferences and many more features.