Graph Component (ActiveX) 

Graph Component provides 2D plotting facilities, it accepts any number of curves and provides user with ability to zoom, resize and print.
graph plot online offline 2d plotting zoom resize print scrolling tracking activex math

DSSF3 Basic 

The free version of the advanced sound measurement software DSSF3 is now available. It consists of the signal generator, sound recorder and player, and the peak level meter.
sound noise measurement realtime acf spl iacc iacf spectrum fft audio signal generator