IDE

Free

Flexible text editor with text coloring

Free

A tool which can create and modify XCode project and file templates.

Free

Text and code editor based on Emacs.

Free

Now available. It includes CLOS support (conforming to the Metaobject Protocol documented in "The Art of the Metaobject Protocol")...

Free

Ren'Py is a free, open source engine for creating visual novel and life simulation games.

Prolog interpreter, Edinburgh-syntax Prolog

Free

Cocoa app dev environment using an intuitive BASIC-style language.

Free

Ghostscript library enables developers to view and convert PS/EPS/PDF files to other formats.

Free

Manage and process data in a development cycle.

Free

Compile programming data from Pascal projects.

Free

MPW is a development environment for Mac OS 7.x/8.x/9.x, providing tools for C, C++ and assembly-language programming.

Free

QuickTime 7.0.2 SDK provides headers, examples and documentation for creating software with QuickTime APIs.

Free

Optimize mobile product development process.

HyperCard is Apple's software dev tool for all skill levels.

Free

Develop programming projects based on Fortran.

Free

CroosUI RAD Tools enables developers to create cross-platform apps for web, desktop & mobile devices.

Free

Easy-to-use, native Cocoa IDE for the Arduino platform, designed to replace the official Arduino IDE without compatibility issues.

Free

web app development

Free

Mac OS X development environment.

Free

Allows data entry from nearly any Bluetooth device or RS-232 legacy devices into nearly any app.