Coyote

When the plugin is installed and its filters are enabled, it replaces image alt attributes in your posts with those retrieved from a Coyote service.
When Coyote service moderators change image descriptions and remote updates are enabled, those filters will also reflect these updates.

Read more

See readme.MD for more information on various settings and tools.

Use of 3rd party service

Once the plugin is set up to connect to a valid Coyote service API account, image meta-data stored in your WordPress installation may potentially be stored by the Coyote service.
The plugin may also query the Coyote service to provide necessary functionality.
Please familiarise yourself with the Coyote Terms of Service.