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15.10.1 Packages that Org cooperates with

calc.el by Dave Gillespie
Org uses the Calc package for tables to implement spreadsheet functionality (see The spreadsheet). Org also uses Calc for embedded calculations. See Embedded Mode.
constants.el by Carsten Dominik
Org can use names for constants in formulas in tables. Org can also use calculation suffixes for units, such as ‘M’ for ‘Mega’. For a standard collection of such constants, install the constants package. Install version 2.0 of this package, available at Org checks if the function constants-get has been autoloaded. Installation instructions are in the file, constants.el.
cdlatex.el by Carsten Dominik
Org mode can use CDLaTeX package to efficiently enter LaTeX fragments into Org files (see CDLaTeX mode).
imenu.el by Ake Stenhoff and Lars Lindberg
Imenu creates dynamic menus based on an index of items in a file. Org mode supports Imenu menus. Enable it with a mode hook as follows:
          (add-hook 'org-mode-hook
                    (lambda () (imenu-add-to-menubar "Imenu")))

By default the Imenu index is two levels deep. Change the index depth using the variable org-imenu-depth.

speedbar.el by Eric M. Ludlam
Speedbar package creates a special Emacs frame for displaying files and index items in files. Org mode supports Speedbar; users can drill into Org files directly from the Speedbar. The < in the Speedbar frame tweaks the agenda commands to that file or to a subtree.
table.el by Takaaki Ota
Complex ASCII tables with automatic line wrapping, column- and row-spanning, and alignment can be created using the Emacs table package by Takaaki Ota. Org mode recognizes such tables and export them properly. C-c ' to edit these tables in a special buffer, much like Org's ‘src’ code blocks. Because of interference with other Org mode functionality, Takaaki Ota tables cannot be edited directly in the Org buffer.
C-c '     (org-edit-special)
Edit a table.el table. Works when the cursor is in a table.el table.
C-c ~     (org-table-create-with-table.el)
Insert a table.el table. If there is already a table at point, this command converts it between the table.el format and the Org mode format. See the documentation string of the command org-convert-table for details.