TextMate is a text editor for MacOS X which binds common Unix tools and features and is useful as programming editor. It provides project sessions, regex search and replace, auto indentation, bracket pairing, a clipboard history, column selections, word completion, CSS-style selections, language grammars and syntax highlighting (50 langs), document outlines, shortcut words, code folding, visual file bookmarks. It's also plugin-extendable, allows macro recording, shell command invocation, SCM int
Fink is a package management system for Mac OS X and Darwin systems. It utilizes Debians apt and dpkg tools, while "fink" itself is the source to package building system. The project also adapts sources for broader compatibility with Mac/Darwin systems.
FLTK (fulltick) is a lean but modern GUI toolkit written in C++ with bindings for Perl, Python, Ruby, Lua and Tcl. It's usable and looks alike on all platforms, provides full internationalization, 3D rendering via OpenGL and an internal GLUT backend, static linking, does not require macros or preprocDessing, still comes with a solid set of widgets, and its GUI designer FLUID.
FUSE for OS X provides foreign filesystem support under Mac OS X. It's the successor to MacFUSE. And like the Linux variant it provides a user-land filesystem driver API, which is easier to develop for. Command-line tools are provided, and a kernel module which facilitates binding drivers like sshfs, procfs, AccessibilityFS, GrabFS, LoopbackFS, SpotlightFS, and YouTubeFS to the file system.
HCFR is a video projector and monitor calibration software. It's derived from ColorHCFR version 2.1 and aims for more open development processes. It integrates ArgyllCMS, DVD or internal pattern generation, grayscale, gamma and gamut inspection, madVR calibration, and meter support.