I will use this opportunity to mention Maxima (<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Maxima_%28software%29" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Maxima_%28software%29</a>) that was developed by one of the best math professors that I have had the privilege to learn from: Bill Schelter. It was forked from Macsyma and released under the GPL and still appears to be actively maintained.