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Sija Framework is an open source software implementation of some guidelines and a small framework written in PHP to help quickly and easily create simple REST services and web applications using JSON API.
Spark States is a project to provide some custom state store providers for Apache Spark.
Apache Flink is an open source stream processing framework with powerful stream- and batch-processing capabilities.
Twitter Chill is a set of extensions for the Kryo serialization library including serializers and some classes to ease configuration of Kryo in systems like Hadoop, Storm, Akka, etc (and Flink of course!).
Sberbank Open Data is a sample to show how to process some data using Filebeat and Logstash and how to visualize that to get some information. The open data were downloaded from a Sberbank site. Also, Vagrant and Ansible are used for deploying and testing.