A Smith chart is a tool used in electrical engineering that shows how the complex impedance of a transmission line varies along its length, and simplifies the design of impedance matching networks to match the line to its load.

linSmith is a Smith Charting program, mainly designed for educational use. As such, there is an emphasis on capabilities that improve the 'showing the effect of'-style of operation.

Its main features are:
* Definition of multiple load impedances (at different frequencies)
* Addition of discrete (L, C, parallel and series LC, and transformer)
and line components (open and closed stubs, line segments)
* Connection in series and parallel
* Easy experimentation with values using scrollbars
* A 'virtual' component switches from impedance to admittance to help
explaining (or understanding) parallel components
* The chart works in real impedances (not normalized ones)
* Direct view of the result on the screen
* Ability to generate publication quality Postscript output
* A 'log' file with textual results at each intermediate step
* Load and circuit configuration is stored separately, permitting several
solutions without re-defining the other