TclSpice is an improved version of Berkeley Spice designed to be used with the Tcl/Tk scripting language. The project is open-source (BSD license) and based upon the NG-Spice source code base with many improvements

Features :
Fully Tcl scriptable - installs with 'package require spice' statement

Hspice syntax (SpicePP).

GUI interfaces, various (Tk).

SpiceWish (BLT graph widget)

BLT (tcl compatible) vectors for storage, manipulation and arithmetic upon Spice waveforms.

Xspice additions (Georgia Tech).

Trigger upon waveform events.

Spice 'simulator state' save and restore for rapid 'what-if' simulations (no longer need to re-simulate from the beginning each time a device value is changed).