The ever-popular Emacs, [[https://insights.stackoverflow.com/survey/2019#technology-_-most-popular-development-environments][at least popular enough to be used by 4.5% of the respondents from the Stack Overflow survey of 2019]].
It is one of the usual symbol of extensibility and [[id:e8c1218f-35a4-4dd3-a174-5d8f848b74b2][Free software]] due to its ecosystem of plugins and extensions integrating Emacs.
Among other things, it is also where [[id:c422175a-5b65-4311-8cc6-11efd55364e8][Org mode]] documents are often written from as well as making use of [[id:5569a49f-c387-4da2-8f68-d8452e35ee5b][Org mode: Babel]] as a component for [[id:6eeb7a24-b662-46d6-9ece-00a5028ff4d8][Reproducible research]].