Comment by lbenes

If you don't mind using a desktop app, there are still many great tools for hobbyists and for teaching.

Recently I've used: Qucs: https://sourceforge.net/projects/qucs/

Circuitmod: https://sourceforge.net/projects/circuitmod

These were also in my bookmarks of tools I've explored: CEDAR Logic Simulator: https://sourceforge.net/projects/cedarlogic

Logisim: https://sourceforge.net/projects/circuit/

For teaching LogicWorks is still my favorite.