Haworthia truncata 'Lime Green'
Native range: South Africa
Known names: Horses' Teeth
Hardiness: Best kept above freezing
Mature Size: ~5" tall, 5" wide
Light: Morning sun, dappled light, half day sun- avoid hot afrernoon sun.
Water: Water more often during spring, taper watering after summer. Water when lightly wrinkly during winter. 
Soil: Fast draing, coarse succulent soil
Dormancy Period: Summer
Pet-Safe: Yes
Plant Size: Grown in 2.5" pot
 
Haworthia truncata 'Lime Green' forms a fan-shape cluster as they grow. This cultivar produces yellowish-green leaves instead of the standard dark green. Leaves are somewhat stiff but still snappable. Clumps over time.
Haworthias, in the wild, generally grows underground with their "windows" poking up slightly to catch some sun. These succulents will actually do poorly if exposed to too much sun so it is best to grow them either with morning sun only or dappled sun or somewhere shaded away from the hot sun. 
Avoid overwatering in Summer; they'll end up rotting if the soil is wet and the weather is hot.