Zack made a comprehensive study on oracles in blockchain technology, you should check it

https://github.com/zack-bitcoin/amoveo/blob/master/docs/progress_reports/May_2018.md

A sneak peek:

What teams are working on this technology?
Amoveo, Augur, Group Gnosis, Aeternity, Zen Protocol, Bitshares, STOX, Bodhi, spectre.ai, Fun Fair, ZeroSum Markets, Variabl, and Bitcoin Hivemind.

Each team will be ranked in each of the categories from 0 to 10.

0 there is no plan on how to achieve goal
2 there is a plan on how to achieve the goal
5 most of the code is written for this goal.
8 there is working code with passing tests
10 there is an active community of people using this tool
channels, shards, light nodes, channel markets, oracles, blockchain, community, trading fees, elegance
C S L M O B C F E total
Amoveo 10 8 10 10 10 10 5 10 10 83
Group Gnosis 1 0 5 0 8 10 10 5 3 42
Fun Fair 2 0 5 0 0 10 8 10 3 38
Variabl 1 0 5 0 0 10 2 5 3 26
Stox 0 0 5 0 0 10 5 0 3 23
Augur 1 0 5 0 0 10 8 -5 3 22
Bitshares 0 0 0 0 0 10 9 -5 6 20
Bodhi 0 0 3 0 0 10 6 -5 4 18
Aeternity 0 0 0 0 0 5 9 -5 8 17
Spectre.ai 0 0 5 0 0 10 6 -10 3 14
Zero Sum Markets 0 0 5 0 0 10 2 -10 3 10
Zen Protocol 0 0 0 0 0 3 7 -2 1 9
Bitcoin Hivemind 1 0 0 0 0 5 2 -5 5 8

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