Free real time software for windows

GDS Real Time VuMeter is a nice RealTime vumeter activex control.
You can use its own draw method, or you can use the buffer event to write your own.
Example and source is included.
Note: Freeware for private use only.

iCubator Labs presents ICLinx 3001 v.1.1.0, a Real Time Link Popularity Checker. An all new and innovation class of software, ICLinx does the work for you. Fully automated, ICLinx delivers accurate link counts in a timely manner, on a specified URL. ICLinx can be set with sound on, or as a visual, non-intrusive alert. The user no longer needs to visit other web sites, repetitively type in URLs and codes, and then be limited to the number of queries that can be viewed per day. Built on scalability, ICLinx automatically calibrates for itself, the ever changing engine link count algorithm.
The functionality doesnt stop there. ICLinx allows for the retrieval of collected data with quick graphing capabilities for trend analysis. The user may also type in and check other URLs in the lower section of the window, and track the link popularity ranking for those specified URLs as well. All that, and ICLinx is Free!
To support ICLinx 3001 Real Time Link Popularity Checker users, an online member support community is available that includes downloads, power links, online documentation, and message boards. ICLinx is the most convenient link popularity checker on the Web today.

Real Time Polar Coordinate Vector Audio Manipulator is more of an experiment than a proper, fully-fledged audio program.
Its based on an example program in Charles Petzolds Programming Windows (fifth ed.), called Connect, which basically acts in the same way, but without any sound, user configurable colours etc.
Basically, RTPCVAM gives you a big white drawing area, onto which you can place a number of points by clicking the left mouse button. As long as the button is held down (and you have reached the maximum no. points),
moving the mouse will continue to drop points on the drawing area. Its when you let go of the button that the fun starts though...
Letting go of the mouse button causes the program to start joining up every point to every other point, and the program will start outputting sound. How the sound is output depends on the current line being drawn. Basically, the program calculates the length of the line, and its angle (i.e. the polar coordinates), and plays a section of the specified sound (the length of the section is determined by the length of the line), pitching it according to the lines angle.
This process is repeated for every single line drawn, resulting in what is probably best described as a cacophony (though an interesting cacophony, in
my opinion).
You can load any wave file you like as a sound source, although beware of using sounds that arent 44100Hz, 16-bit and mono. The program should load them, but the audio engine isnt very sophisticated, and will just play them as if they were 44100Hz, 16-bit and mono (i.e. itll sound pretty stupid...).
Dont worry if you dont have any wave files though, on start-up the program fills its buffer with a 440Hz sine wave, which can give interesting results on its own. Its usually a good idea to have the sample volume slider set to about
half way (depending on the sound source), as the way the sounds overlap almost always leads to a certain amount of clipping if you leave it at higher values.
As well, you should be careful about giving the program longer wave files, because this means the program will spend longer playing the sound for each line.
The only other thing of note is the Byte Order radio buttons. These should really have ended up in the group box with the wave file loader, but there wasnt room. Basically, they just change which order the program reads the bytes of the input wave file (this option is included because I couldnt remember which way it works on PCs/Intel machines - I think its left byte first...).