1. [n.d.]. Apache Hadoop. https://github.com/apache/hadoop. [n.d.]. Apache Hadoop. https://github.com/apache/hadoop.
2. [n.d.]. Apache Spark. https://github.com/apache/spark. [n.d.]. Apache Spark. https://github.com/apache/spark.
3. [n.d.]. Bitcoin. https://github.com/bitcoin/bitcoin. [n.d.]. Bitcoin. https://github.com/bitcoin/bitcoin.
4. [n.d.]. Couchbase. https://www.couchbase.com. [n.d.]. Couchbase. https://www.couchbase.com.
5. [n.d.]. Jiffy. https://github.com/tkobus/jiffy. [n.d.]. Jiffy. https://github.com/tkobus/jiffy.