New Posts & New Threads
The default New Posts and New Threads widgets have been extended to support an additional thread type filter. When editing a widget of the aforementioned types under ACP > Appearance > Widgets, at the bottom of the edit page, the Limit to thread types option allows you to select which thread types are shown in the widget.
Thread Types Plus provides you with a new widget called Unanswered Questions. To add this widget, navigate to ACP > Appearance > Widgets, click Add widget and select the widget definition [TH] Thread Types: Unanswered questions.
This widget will show a list of all question threads (narrowed down by the selected filters), that have not received a reply.