VLC media player is a multimedia player, framework, streamer, and encoder. It can play inputs like files, network streams, DVDs, audio CDs, Blu-Rays, capture devices, and screens. It can play most audio and video codecs and formats (MPEG 1/2/4, H264, VC-1, DivX, WMV, Vorbis, AC3, AAC, MKV, etc.), but can also be used to convert to different formats and/or send streams through the network.
F-Script is a lightweight scripting layer specifically designed for the Mac OS X object system (i.e. Cocoa). It provides scripting and interactive access to Cocoa frameworks and custom Objective-C objects. It aims to be a useful and fun tool for both beginners and experts, allowing interactively exploring, testing, and using Cocoa-based objects and frameworks.
XEMPIM is a complete rewrite of EMPIM (the Excessively Modular Personal Information Manager) for Mac OS X. It is written in Objective C/Cocoa to provide maximum compatibility with the OS X environment. The goal of (X)EMPIM is to create a core program which implements methods for loading, unloading, displaying, and communication between autonomous dynamically loadable modules. Each module provides a separate aspect of a standard PIM (Contact List, Calendar, etc).