The tree is the"Star fruit" Tree.
With botanical name, AVERRHOA CARAMBOLA
Family:- OXALIDACEAE (wood sorrel, Bermuda buttercup, oca).

It is a rare but highly nutritional breed and it is used widely in the kitchen.

BENEFITS INCLUDES
health
¶ Used in the home as remedy for hangovers and sun-burn.

¶ Works well on coughs, fever, ulcer and sore-throats.

¶ Effectively combats diabetes.

¶ Improves digestion.

¶ Great choice for weight loss as it contains lot of fibre.

¶ It is sometimes given to lactating mothers to stimulate the flow of milk.

nutritional value
¶ Energy 128 kj (31 kcal)
¶ Carbohydrates 6.73 g
¶ Dietary fibre 2.8 g
¶ Protein 1.04 g
¶ Vitamin C 34.4 mg
¶ Vitamin E 0.15 mg
¶ Iron 0.08 mg
¶ Fat 0.33 g
¶ Sugars 3.98 g
¶ Zinc 0.12 mg
¶ Calcium 3 mg
¶ Vitamin B6 0.017 mg
¶ Choline 7.6 mg
¶ Potassium 133 mg

economic value
Nowadays, herbal medications are becoming popular worldwide as an alternative therapy to drug medication.

In addition to food source, Star-fruits are also considered as herbs in many parts of Brazil, China, India, and Malaysia as well as in Taiwan, and widely used in Ayurvedic and traditional Chinese Medicine preparations.

We can say AVERRHOA CARAMBOLA,
is a literal one stop medicine shop.

Thanks @emjoe