There are oracles since humanity wondered what the future would bring, or to help with decisions of the present. Simple ones and elaborate ones. The most simple one has survived the ages: tossing a coin. Or whatever is at hand, like pebbles or sticks. Everywhere one can find something, with which to solve the most difficult question of all: "yes or no"?
Another way is using your intuition. Because it has a way to hide, people found ways to trick it into appearing: eg by watching something random and accepting it as meaningful. The flight of birds - for the birds not random, probably, but often for us. Or the curls of smoke, moving water, dancing flames, the drabs in a cup of coffee or tea, numbers obtained in a random way.
The planets and stars in the sky are yet another way of foreseeing the future - or understanding more about the present.
Shen Shu by Zhuge Liang, an oracle of 384 poetic verses.
German translation by Stefan Kappstein, English translation by Yujing He.
Geomantic tetragrams: an old European oracle of 16 four-line figures of single or double dots. It is like the Yijing, but very simple in comparison.
"Oude Europese voorspelkunst"' by Karen Hamaker-Zondag.
The Ling Qi Jing, 125 verses by Tung Fang Shuo, between 140 - 86 BCE
Two translations in English:
'Ling Ch'i Ching' by Ralph D Sawyer and Mei-chün Lee Sawyer,
and 'Spirit Tokens of the Ling Qi Jing' by Ivan Kashiwa.
The Elemental changes, 81 four-line figures (tetragrams) with for each line three different possibilities: one, two or three parts. Each figure belongs to a period of 5 days.
(detail from The Elemental Changes by Michael Nylan)