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ActiveTcl: Tcl distribution for Windows, Mac OS X, Linux - ActiveState.

Freeware LAN scanner that resolves NetBIOS, MAC, IP addresses, HTTP servers.

ActivePerl: Perl distribution for Windows, Mac OS X, Linux - ActiveState.

Free Active Directory Integration and single sign-on for Linux and Mac OS X

Perfboard provides an extensive readout of system performance data for Mac OS X.

It is a native Mac OS X implementation of a network protocol analyzer.

Mobile/PC Multi-protocol Messenger & Media Sharing-Win- Mac-Linux-iPhone-Android

A Mac OS 8 Contextual Menu Plug-in for locating the Creator App of a document.

Eddy Timer is a simple to use time reminder for Mac OS X.

LiquidCD is a free burning Application for Mac OS X.