Compendium 1.3.04 might be thought of as ‘the visual language release’!
We’ve opened up the tool for you to define your own custom node and link
types, add labels to links, add background images to maps, and draw
pictures over the top of maps. It is available for Windows, Mac, and Linux
at http://www.compendiuminstitute.org/download/download.htm

New Features:

Background Map images:

You can now add background images to Maps (except the home windows).


Stencils:

On the Tools menu are two new options 'Manage Stencils' and
'Stencils->' with a submenu listing available stencils.
There are 3 default stencil sets provided to start you off. (they are
all variations on the same set).
Stencils are basically stored sets of parameters for creating new
nodes (reference/map/list) with images.
When a stencil set is opened it will appear on the left hand side of
the screen in a tabbed pane.
You can then drag off stencil items and a new node with the given
parameters will be created.
You can create your own stencils, modify existing stencils, and more
with the Manage Stencils option.


Links:

Links have been made primary objects, with three main properties:
link labels, link groups, and link transclusions.

- Link labels: Links can now have editable labels like nodes. If
there is no label on a link and you wish to add one, rollover the
center of the link to local edit box. "

- Link transclusions: If you copy and paste two nodes with a link
between them, the link will also be transcluded as well as the nodes.
Any changes to the labels or other properties of the link in one view
will immediately be reflected in any other views that link is in.
Deleting a link from one view will not affect its inclusion in other
views.

- Link groups: There is a new facility on the Tools Menu to create
and manage link groups.


Link groups and stencils are saved as XML files for sharing.


Scribble layer and drawing options:

A scribble layer has added which when switched on sites over the node
layer and allows the user to draw over the nodes and links. These
scribbles can be saved to the database.


Plenty more information at
http://www.compendiuminstitute.org/download/download.htm