SelfControl is an OS X application which blocks access to incoming and/or outgoing mail servers and websites for a predetermined period of time. For example, you could block access to your email, facebook, and twitter for 90 minutes, but still have access to the rest of the web. Once started, it can not be undone by the application, by deleting the application, or by restarting the computer – you must wait for the timer to run out.
GanttProject is a cross-platform desktop tool for project scheduling and management. It runs on Windows, Linux and MacOSX, it is free and its code is opensource.
IceClean is a powerful System Maintenance and Optimization Tool using only UNIX built-in System Tasks to help your Mac stay healty and to keep it running smoothly.
Seashore is an open source image editor for Mac OS X's Cocoa framework. It features gradients, textures and anti-aliasing for both text and brush strokes. It supports multiple layers and alpha channel editing. It is based around the GIMP's technology and uses the same native file format.
Sophos unveiled free antivirus software today that Macintosh users can install to detect and block malware that targets computers running the Mac operating system. Sophos Anti-Virus Home Edition for Mac also detects malware written for Windows that Mac users can spread via USB drives and e-mail