# TWiki Add-Ons
_Add functionality to TWiki with extensions not based on the TWiki scripts._
## Overview
An add-on runs separately from the TWiki scripts, e.g. for data import, export to static HTML, etc. Add-Ons normally do not call any TWiki code directly, though may invoke TWiki scripts. There are different types on add-ons, they may be stand alone scripts, browser plugins, office tool extensions, or even a set of TWiki topics that form a TWiki application.
**_Relevant links on TWiki.org:_**
- TWiki:Plugins.AddOnPackage - list of all contributed add-on scripts
- TWiki:Plugins.AddOnDevelopment - discussion and feedback on contributed add-on scripts
- TWiki:Plugins.AddOnBrainstorming - open forum for new add-on script ideas
- TWiki:Plugins.AddOnPackageHowTo - instructions and template to create a new add-on topic
**_See other types of extensions:_** [[TWikiContribs]], [[TWikiPlugins]], [[TWikiSkins]]
## Add-Ons Installed on this TWiki
# TWiki Installation Error
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## Installing Add-Ons
- Download an add-on from TWiki:Plugins.AddOnPackage.
- Follow the installation instructions in the add-on topic.
## Creating new Add-Ons
- Visit TWiki:Plugins.AddOnPackageHowTo and follow the instructions.
**_Related Topics:_** [[DeveloperDocumentationCategory]], [[AdminDocumentationCategory]], TWiki:TWiki.TWikiPluginsSupplement
-- **_Contributors:_** TWiki:Main.PeterThoeny