I/O performance Analysis Tool
Open Source Solid Modeling CAD
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
QuickMAN is a Mandelbrot fractal generator with multicore support. ASM-optimized code reaches billions of iterations per second on fast CPUs. Features an easy-to-use GUI, realtime pan/zoom, multiple palettes, image logging, and saving in PNG format.
Open System Testing Architecture - a distributed software testing architecture designed around CORBA. The current toolset has the capability of performing scripted Web (HTTP and HTTPS) heavy load tests with performance measurements from Win32 platforms.
Battery monitoring and health tool.
Having been a Mac OSX user now for some years I appreciate the simplicity of CoconutBattery (http://www.coconut-flavour.com/), which shows you all relevant information of the battery of your laptop (iBook, PowerBook, MacBook, ...) and has one outstanding feature: you can save the current health state of the laptop's battery and thus monitor the long term development (degradation) of the battery. Since I have to work in Windows at work :-( I was looking for a similar tool in the MS world. You can find a number of battery monitoring programs for MS Windows, which give you a plethora of (useless) information - or do not work at all. Finally I decided to make one of my own (the world waited for that so badly!). And here it is. Since I did not want to restrict it to Windows only I made it a GTK application, which is cross platform portable. I created the low level data gathering functions for both Windows and Linux. You are very welcome to add additional ports (e.g. BSD or whatever).
Telecommunication Application Transaction Processing Benchmark generates a transactional load over parallel client connections, targeted at a database system under test. It is modeled after a mobile network application HLR (Home Location Register).
A 3D benchmark comparing the different features / extensions of OpenGL. Made for the Linux operating system, but is portable to any other OS that SDL supports.
Command-line performance tester for disks, CPU and memory
Utility for quick performance testing of main system components: disks, CPU and memory. Initially was designed to detect problems in virtual environment. Windows only (XP/2003 and later).
A Windows console app to delay a specified number of seconds and exit if a key is pressed. Handy for automation batch files. For example: :start batdelay 10 if ERRORLEVEL 1 goto :EOF ...do something goto start
A generic, vendor-independent open-source application to determine the performance of a pub-sub infrastructure.
System monitor is a Java library for monitoring system resources like memory and CPU consumption. The library provides unified cross-platform API for accessing system information. Currently Linux and Windows are supported via Java Native Interface (JNI).