This presentation illustrates how the GNU Emacs text editor provides an powerful integrated environment for reproducible research, effectively bypassing the need for juggling different software in order to write and execute code, manage data or write papers. GNU Emacs as a long history, and is still widely used and supported by a very active community of users and developers. A very popular feature of GNU Emacs is Org-mode which, at its core, offers a markup language similar to Markdown.

Following a brief introduction to Org-mode, this presentation demonstrates its use for reproducible research: straightforward mixing of prose and code, execution of code blocks as well as display of the results. With Org-mode, GNU Emacs is turned into a computational notebook which functionalities goes well beyond popular alternatives such as Jupyter. Code blocks are not restricted to a particular programming language and data can be passed between them: generate data in C, analyse it in Python, visualise it with R, all in one single executable document. Moreover, Org-mode documents are nothing but plain text, making them inherently portable, sustainable, and suited to version control - crucial qualities for academic research. Moving on, I illustrate the export of Org-mode documents to richer formats: PDF, ODT, HTML and many more - all from within GNU Emacs. Lastly, I broaden the scope of this presentation and discuss the open nature of GNU Emacs itself. Indeed, GNU Emacs is free (as in freedom) software under a copyleft license. This ensures that GNU Emacs remains sustainable, community-owned software: GNU Emacs will never be "discontinued" or its features reduced inside a "community edition".