In the All Around Type-Moon series:
V.1 - Ahnenerbe no Nichijou
Characters from various Type-Moon franchises, such as Fate, Tsukihime, and Kara no Kyoukai are able to hang out at the strange cafe called Ahnen Erbe. They chat together and deal with various curiosities such as a nosy talking cat or a "pot of happiness," which expels a gas that causes people to laugh.
V.2 - Ahnenerbe Kyoushikyoku
The crossover this time include Fate Extra, Fate/Kelaid Liner Prisma Illya and Fate/Zero.