Hi. I found these spiders at my friend's mango plantation here in the Philippines.

The first one was sitting on a small shrub, looks like a huntsman but im not really sure. The body is nearly an inch long.

The second one has two "horns" on its back, and maybe just half a centimeter only.

The third is also about 5mm size. On it's orb were four "victims" wrapped in silk and arranged in a straight, vertical line (its orb is vertically oriented) with the spider in the middle. Seems like these "victims" at set aside to be eaten later. When disturbed, the spider vibrates on its orb.
Need help in identifying these spiders. Thank you!

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The first one is an orb-weaver from the family Araneidae.  It looks like Eriophora, but not sure if that genus is in the Philippines.  She will hide like this during the day and then spin a huge web, over 1 meter in diameter, between two trees.

The second is a net-casting spider, family Deinopidae, which hunts using a small web held between its front two pairs of legs.

The third image is too small to be clear but looks like another Araneidae, possibly Araneus?  Many orb spiders store prey as you describe, and also 'garbage lines' of the debris from previous meals.

Sorry, i disagree on the second,
It is family Philodromidae, something like Tibellus sp.