How to develop a module or addon for Dolibarr ?

A page on the wiki is available to describe how you can develop a plugin or full module to Dolibarr and deploy it. This can be done in most cases without modifying Dolibarr core code.
Tutorial is available on Dolibarr Wiki at the following page:

Dolibarr ERP CRM is Open Source software. You can download, use and redistribute it at any time. You want to test the latest version ?