Using AppleJack, you can repair your disk, repair permissions, validate the system's preference files, and get rid of possibly corrupted cache files. In most cases, these operations can help get your machine back on track.
OpenProj is a free, open source project management solution. OpenProj is a complete replacement of Microsoft Project, and other commercial project solutions. OpenProj is ideal for desktop project management and is available on Linux, Unix, Mac or Windows
Gobby is a free collaborative editor based on libobby, a library which provides synced document buffers. It supports multiple documents in one session and a multi-user chat. It runs on Microsoft Windows, Mac OS X, Linux and other Unix-like platforms.