The reference implementation of Org is part of Emacs.
If you already have Emacs installed, you can start using
org-mode right away!
You can install the latest version of Org as a package by invoking
M-x package-install RET org RET once you have configured Emacs
to include Org ELPA as a package repository.
The bleeding-edge development version or Org is available at code.orgmode.org. You can clone the repo via:
~$ git clone https://code.orgmode.org/bzg/org-mode.git
There are also many packages that augment Org available on MELPA.
Once you're ready to Org, check out the Quickstart page for an overview of the syntax.
The Emacs starter kits Doom, Spacemacs and Scimax come with a curated
set of packages and configurations that aim to enhance Org mode (and
Emacs more generally) for particular use cases. They include Org along
with integrations between
org-mode and other modes (such as
evil-mode). Here are links to the current packages included with Doom,
and Spacemacs. Scimax is deeply integrated with Org so a good place
to start is the manual. Doom installs a version of Org that is close
to the development
HEAD, while Spacemacs and Scimax track org elpa.
Starter kits often make significant changes to the default user experience for Emacs. If you are looking for something closer to vanilla Emacs there are popular configs such as Purcell's emacs.d that include org-mode customization and Org-related packages.
While the full set of Org features is currently exclusive to Emacs, basic functionality for Org files has been implemented for a variety of editors. Here are some extensions for other editors that enable support for Org files.