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"Diglog" is an interactive digital circuit simulator that is used for digital electronics projects and education worldwide.
And is part of a package called "chipmunk".
A huge benefit is the interactive approach.
In which you can change your construction while running the simulation. An oscilloscope is also included to watch waveforms. Software is GPL-v1 Licensed and runs on FreeBSD, Linux and win32 at minimum.
Projects like pipelined microcontroller with lcd and keyboard has been realised inside the simulator.
Trivia
Will create .lfo files. Can plot circuits, oscilloscope graphs.