Those are done on the trial of CircuitLab, which looks pretty nice, but only has a limited time trial period. I'm unsure how long the trial period is. Also just been taking screen shots rather than trying to save anything at this point. I've just so far been using it to draw, but the program also offers testing and such...The paid version is more than I'd probably want to spend.
I'm going to try some other things out as well, maybe once I've gotten hands on with a couple programs I can make a better recommendation. Up till now my experience with any programs for this has been with a windows 95 version of a program called 'Electronics Workbench' and it actually works really well... just doesn't have access to any fancy parts. I recall it being a fairly expensive program when purchased, but that was almost 20 years ago now.
JGL
Edit: I tried to give scheme-it a try, but had trouble with it freezing my browser on my obsolete MacBook. The same program under the name PartSim seems to work, however. I'll try it out for the next schematic I need to make.
