According to the Kuroshitsuji website, there are 6 OVAs included in the DVD releases.
DVD 2: Ciel in Wonderland (Part 1)
This re-imagines the cast of Kuroshitsuji II as characters in Lewis Carroll's Alice in Wonderland story.
DVD 3: Welcome to the Phantomhive's
This is meant to be like a simulation game. Elizabeth invites a lady (perhaps the viewer) to join her at a ball held at the Phantomhive mansion.
DVD 5: The Making of Kuroshitsuji II
This is a Hollywood style documentary with behind the scenes interviews with Sebastian, Ciel, Claude and Alois etc.
DVD 6: Ciel in Wonderland (Part 2)
This re-imagines the cast of Kuroshitsuji II as characters in Lewis Carroll's Alice in Wonderland story.
DVD 8: The Tale of William the Shinigami
William and Grell have to train new shinigami and reminisce about when they were training partners.
DVD 9: The Spider's Intention
The life in Trancy household and how those work under Alois is caring for him.+ More
More Seasons
Characters & Voice Actors

Abberline, Fred
Supporting
Aberline, Edward
Supporting
Agni
Supporting
Anafeloz, Hannah
Supporting
Asman Kadar, Soma
Supporting
Baldroy
Supporting
Blanc, Angela
Supporting
Cainz, Drocell
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