XCircuit is a [UNIX]/[X11] (and now [Windows], if you have an X server running) program for drawing publishable-quality electrical circuit schematic diagrams and related figures, and produce circuit netlists through schematic capture. XCircuit regards circuits as inherently hierarchical, and writes both hierarchical [PostScript] output and hierarchical [SPICE] netlists. Circuit components are saved in and retrieved from libraries which are fully editable. XCircuit does not separate artistic expression from circuit drawing; it maintains flexiblity in style without compromising the power of schematic capture.

XCircuit now makes extensive use of the [Tcl] scripting language as a command-line interpreter. The use of Tcl scripts to interpret and control XCircuit internal data structures makes it possible for the end-user to modify the behavior of xcircuit to suit his or her own needs. Current work on adding features to XCircuit (as opposed to the usual bug-fixing grunt work) attempts to retain the current interface more or less unchanged, and define new capabilities through Tcl scripts. See the [http://opencircuitdesign.com/xcircuit/tcl_commands.html%|%XCircuit Tcl Reference page] for details of the extended Tcl interpreter interface to XCircuit.
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   * Where: http://opencircuitdesign.com/xcircuit/
   * Related: http://opencircuitdesign.com/pcb/ (PCB 3.0 is a Tcl/Tk branch of a printed circuit board layout designer tool, which can be used alongside XCircuit)

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