Scuttlebot is a P2P replicating datastore designed to facilitate decentralised applications: https://scuttlebot.io/
The list of available apps is impressive for a young project: https://github.com/ssbc/ssb-handbook/blob/master/applications.md
The apps remind me of IPFS' ambitions, although the protocol is different.
miniblog.
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GraphQL is a really elegant way of querying a datastore, instead of REST or SQL. Eg https://waywardmonkeys.org/2016/03/15/graphql-beyond-the-web/ (querying OS metadata example)