*bump again*
I added a free wave analyzer called Spectrogram (at version 16 now). It turns your computer into a Spectrum analyzer, using the MIC input of your soundcard. Its totally awesome stuff. Here's a quote from the website regarding its features:
Quote:
Spectrogram version 16 is a freeware dual channel audio spectrum analyzer for Windows 2000/XP/Vista which can provide either a scrolling time-frequency display or a spectrum analyzer scope display in real time for any sound source connected to your sound card. Spectrogram allows unlimited recording and playback of the sounds from the audio spectrum display and can provide very high resolution spectrum analysis of wave files with a wide choice of frequency bands and frequency resolution and either linear or logarithmic frequency scales. Spectrum data logging capability is also provided. Spectrogram is ideal for any purpose related to sound spectrum analysis including
- Analysis and identification of biological sounds
- Analysis of bat echolocation sounds
- Analysis and identification of human speech
- Analysis of vocal and instrumental music
- Evaluation and tuning of musical instruments
- Evaluation and calibration of home audio systems
- Ham Radio audio reception and tuning
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I also came across SwitcherCAD III. The circuit analysis is quite easy to use. I'll test it more to see how well it compares with Orcad PSpice. Check them out!
I wanted to add Octave to the list.. but I had trouble installing it. Its a MATLAB 4 clone, meaning the syntax and keywords are virtually the same. Perhaps its easier to use than Scilab for those migrating from MATLAB.