Buffy (Buffy the Vampire Slayer) can detect vampires within her area.
...like when she sensed Spike hiding behind a tree.
As a vampire himself, Angel (Buffy the Vampire Slayer/Angel) detects on sight that one of Helen Brucker's aides is a vampire.
Blade (Marvel Comics) can sense supernatural activity.
Madame Xanadu (DC Comics)
D (Vampire Hunter D)
P.K.E. Meter (Ghostbusters) tracks ghosts and other entities.
Grimms (Grimm) are able to see the true form of Wesen even when the Wesen don't want them to.
Danny's and his clone Dani (Danny Phantom) Ghost Sense alerts them to the presence of ghosts other than themselves, usually manifesting as a blue mist.
Unlike other Ghost Sense users, Dark Danny's (Danny Phantom) ghost sense is red rather than blue after his fusion with Vlad's ghost half.
Cole MacGrath (Infamous 2: Festival of Blood) using Vampire Sense to discover a disguised vampire.
Lydia Martin and Meredith Walker (Teen Wolf) are able to sense every supernatural creature in Beacon Hills; Meredith put these beings on the Deadpool hit-list, whereas Lydia made a list for her mother to help protect her.
Gooigi (Luigi's Mansion) can sense the presence of Boos.