In here you can find Template Override Packages which are used to provide permanent customisations of Jomres layout files.
These are generally simple that you can use as a pattern for building your own plugins from. See our Template Override Packages manual page for more information.
Once you have installed a Template Override Package you will need to enable it, the manual page shows you how to do that.
Here you will find plugins such as example plugins that are used in tutorial articles in the manual.
Widgets in Jomres are small sections of code that can be added to the dashboard to display information that a property manager might want to see in their control panel.
The Timeline widget in a default installation is a good example of a widget.
You can see a video of the widgets in action on youtube.