Download at blender.org Blender is free and open-source software.

I started learning Emacs in 2010 in order to learn org-mode, and have fallen in love with the whole way of doing things. GNU Emacs is free and open-source software, and has been used longer than I've been alive. So many other applications I used to rely on have converted to a subscription model instead of a perpetual license, but Emacs will be free forever. #+BEGIN_QUOTE In the GNU/Linux world there are two major text editing programs: the minimalist vi (known in some implementations as elvis) and the maximalist emacs. I use emacs, which might be thought of as a thermonuclear word processor. … It is written in Lisp, which is the only computer language that is beautiful. It is colossal, and yet it only edits straight ASCII text files, which is to say, no fonts, no boldface, no underlining. In other words, the engineer-hours that, in the case of Microsoft Word, were devoted to features like mail merge, and the ability to embed feature-length motion pictures in corporate memoranda, were, in the case of emacs, focused with maniacal intensity on the deceptively simple-seeming problem of editing text. If you are a professional writer – i.e., if someone else is getting paid to worry about how your words are formatted and printed – emacs outshines all other editing software in approximately the same way that the noonday sun does the stars. It is not just bigger and brighter; it simply makes everything else vanish. – Neal Stephenson, In the Beginning was the Command Line (1998) #+END_QUOTE

• The app: Stylus Labs Write - works cross-platform (iOS/Win/Mac/Android/Linux) - not free and open-source software but still good - works natively with SVG files - allows working directly on remote files under iOS - insert space, go back and add to the file - revise without having to export to an image or PDF to render the content in the browser