Info Catalog
org: Hooks
org: Hacking
org: Adding hyperlink types
A.2 Add-on packages
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A large number of add-on packages have been written by various authors.
These packages are not part of Emacs, but they are distributed as
contributed packages with the separate release available at
<http://orgmode.org>. See the ‘contrib/README’ file in the source code
directory for a list of contributed files. You may also find some more
information on the Worg page: <http://orgmode.org/worg/org-contrib/>.