XJAnalyser
XJAnalyser is a powerful tool for real-time circuit visualisation and debugging. It provides a graphical view of JTAG chains, giving you complete control, on a pin-by-pin basis, of both pin state (either driven as an output or tristated as an input) and pin value (either high or low when driven), and it has the facility to run SVF and STAPL / JAM files.
Download the XJAnalyzer datasheet