| Class | BugSubscriptionAddView | Browser view class for subscribing someone else to a bug. |
| Class | AdvancedSubscriptionMixin | A mixin of advanced subscription code for views. |
| Class | BugSubscriptionSubscribeSelfView | A view to handle the +subscribe page for a bug. |
| Class | BugPortletSubscribersWithDetails | A view that returns a JSON dump of the subscriber details for a bug. |
| Class | SubscriptionAttrDecorator | A BugSubscription with added attributes for HTML/JS. |
| Class | BugSubscriptionListView | A view to show all a person's subscriptions to a bug. |
| Class | BugMuteSelfView | A view to mute a user's bug mail for a given bug. |