Free memory usage monitor software for mac

Memory Monitor is a little Mac OS X application that displays the memory usage in its Dock icon (and optionally in a floating window), like CPU Monitor displays the CPU usage.
It is published under the GNU General Public License, and the source code is included in the download.
Enhancements:
- French localization now works for non-admin user accounts (fixed access rights for the french resource files).

Website monitor 1 is a convenient program designed with the ability to perform the availability and response speed tests from different locations in US and Europe. The Mac Snapshot widget provides real time view for the latest performance and status data. It allows watching performance per each monitoring location.

Memory Smiley is a free Yahoo widget thatfeatures a smiley changing its mood as your memory usage changes.

System requirements:
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Enhancements
- Freeware.

Have you ever plugged in a USB device only to be underwhelmed by the reaction of OS X? It can be very confusing when the system seems to pay no attention to whats just been plugged in - did it even notice?
USB Monitor eliminates the guess work. It pops up a little window and provides the name of the device thats just been plugged in (or unplugged).
The window follows the visual style of the transparent windows for volume and eject.
Enhancements:
- Fixed memory leak.

iTunes 4 introduced the ability to share music between computers. However, as of version 4.1, iTunes doesnt provide much information about who is connected or what is being shared. This utility monitors iTunes to provide a solution.
The iTunes application must be named "iTunes." In order to be recognized as music files, file names must have one of the following extensions: .wav, .wma, .sn2, .mov, .moov, .mp3, .aiff, .m4a, or .m4p. The iTunes Monitor cant associate a shared music file with a given remote user and files being accessed locally arent distinguished from those being shared. iTunes monitor cant display the name of a file which is being received. iTunes Monitor may not work properly if another application is being used to proxy music streams over the Internet (iTunes 4.0.1 only.)
Since lsof (the UNIX tool at the core of this application) doesnt reliably return complete path names, iTunes Monitor must scan your Music folder when a new file is encountered. It may take a few seconds after launching before it completes its analysis of the files and sockets iTunes is using and initially displays the information.
Enhancements:
- Added support for multiple music folders.
- Bug fixes: fixed memory leaks, improved responsiveness, fix for Panther.

AppMonitor is a small tool designed to watch the CPU usage of any process on your system. Useful for developer who want to control CPU usage of their program.

It features an auto-scaling graphic window, it supports when the "monitored" software is quit and waits until it is launched again (developers know what I mean: compile, test, recompile, retest...).

Best of all, its free, hehe. It was one of my first Cocoa applications, so dont ask for too much, but feel free to mail me if you have suggestions and/or bugs to report.

TeleMonitor is a small widget that can be used by customers from the Belgian ISP Telenet to check the cumulative bandwidth usage for the last 30 days.