LTSpice is already on the list!
Have started reading over the TI book: http://web.mit.edu/6.101/www/reference/op_amps_everyone.pdf
Do you have a link or more info on working with Octave in this way?
Have started reading over the TI book: http://web.mit.edu/6.101/www/reference/op_amps_everyone.pdf
Do you have a link or more info on working with Octave in this way?
For just noodling and doodling around, the functions 'tf', 'ss', 'bode', 'freqz', 'butter', 'tf2sos', 'besself', and 'c2d' are a decent start.
https://ccrma.stanford.edu/~jos/filters/filters.html and http://dspguide.com/ are great online references for digital signal processing, and you'll find that many of the underlying mathematical tools for discrete-time analysis carry over into the continuous domain, too.