performance analyzer

DiskSavvy is a free, fast and easy-to-use disk space analyzer utility.

Open-source disk usage analyzer.

Best data analyzer, 2D/3D-plotting, calc and presentation program.

MTuner is a simple audio frequency analyzer for tuning guitars and others.

Powerful web server log analyzer

Runscanner : a freeware malware and junk analyzer for windows

A simple frequency generator and analyzer.

MAnalyzer is a FFT based analyzer for audio frequency content.

Hybrid 4-th generation FTP analyzer

Enhanced tel stats analyzer program with powerful features.