Atlassian applications come bundled with the Universal Plugin Manager (UPM) which allows for discovery, acquisition, and management of all add-ons without ever needing to leave the administration screens of your Atlassian application. You can access UPM at
$BASEURL/plugins/servlet/upm/marketplace or find out more information on our listing: https://marketplace.atlassian.com/plugins/com.atlassian.upm.atlassian-universal-plugin-manager-plugin
In response to the other answers posted here, all add-on installations will affect the instance as a whole rather than being on a per-user basis. We don't currently have any plans to allow for different sets of add-ons for different user sets.
Thanks for the clarification - that's not how I originally read the question. The way in which customers/vendors can achieve this is essentially with Steffen's response above. Vendors can create multiple add-ons each of which are small and provide new features, and customers can then pick and choose which add-ons they want to install. Internally these add-ons can have shared dependencies without any problems, but the key is that they'll be purchased and distributed separately. We don't have any plans to allow individual add-ons to be licensed for different feature sets.
I think this feature is important for multiple users. I see it in following case:
A base plugin cost e.g. 10$ per year. But you can add some features you need. But currently it isn't possible to give the customers the features he need. Only if create many plugins with different feature packs. But this is not so an good solution. Look at apples app store
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