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More recently, Sebastian Lague has revived a video series on digital circuits [1] and the software featured in the series is made available [2] with a full source code.
[1] https://www.youtube.com/watch?v=QZwneRb-zqA (2 years ago), and more recently: https://www.youtube.com/watch?v=hEDQpqhY2MA and https://www.youtube.com/watch?v=_3cNcmli6xQ
[2] https://sebastian.itch.io/digital-logic-sim
I cannot recommend Digital enough: https://github.com/hneemann/Digital
It is quite new. Clearly inspired by Logisim but not derived from it.
It has support for switches like FETs and relays, and you can implement open collector logic with pull-up resistors.
It can analyze and reduce combinatorial logic. It can generate Verilog and VHDL output from a diagram. And, IMO best of all, you can implement individual components in Verilog/VHDL and plop them as graphical elements in your circuit; when you simulate, it will fire up iverilog or ghdl in the background.
It's fast too; one of the demo circuits is a complete processor and it simulates it at around 300 kHz on my machine.