elpa-org-tree-slide 2.8.16+git20201215.d6e8e91-2 (amd64 binary) in ubuntu impish

 The main purpose of this elisp is to handle each tree in an org
 buffer as a slide by simple narrowing. This emacs lisp is a
 minor mode for Emacs Org-mode.
 .
 Main features:
  - Works nicely on both text console and in graphical environment
  - Live editable presentation
  - Fast switching of narrowing/widen
  - TODO pursuit with narrowing
  - Displaying the current number of slides in mode line
  - CONTENT view during a presentation
  - Slide-in effect
  - Slide header from org file’s header
  - Countdown timer