# TWiki Contribs
_Reusable code that may be used over several plugins and add-ons._
## Overview
TWiki contribs extend the functionality of TWiki, typically used by plugins and add-ons. They may also provide alternative implementations for sections of the TWiki core e.g. user management, or when an extension just can't be implemented as a plugin because it requires very close access to TWiki internals.
**_Relevant links on TWiki.org:_**
- TWiki:Plugins.ContribPackage - list of all contributed contrib packages
- TWiki:Plugins.ContribDevelopment - discussion and feedback on contributed packages
- TWiki:Plugins.ContribBrainstorming - open forum for new contrib ideas
- TWiki:Plugins.ContribPackageHowTo - instructions and template to create a new contrib package
**_See other types of extensions:_** [[TWikiAddOns]], [[TWikiPlugins]], [[TWikiSkins]]
## TWiki Contribs Installed on this TWiki
# TWiki Installation Error
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## Installing Contribs
- Download an add-on from TWiki:Plugins.ContribPackage.
- Follow the installation instructions in the contrib topic.
## Creating new Contribs
- Visit TWiki:Plugins.ContribPackageHowTo and follow the instructions.
**_Related Topics:_** [[DeveloperDocumentationCategory]], [[AdminDocumentationCategory]], TWiki:TWiki.TWikiPluginsSupplement
-- **_Contributors:_** TWiki:Main.PeterThoeny