What are some alternatives?
When comparing twitter.github.io Kestrel and Hortonworks, you can also consider the following products
nginx - A high performance free open source web server powering busiest sites on the Internet.
Hive - The Productivity Platform
CloudAMQP - CloudAMQP automates every part of setup, running and scaling of RabbitMQ clusters. Available on all major cloud and application platforms.
Apache Spark - Apache Spark is an engine for big data processing, with built-in modules for streaming, SQL, machine learning and graph processing.
RabbitMQ - RabbitMQ is an open source message broker software.
Hadoop - Open-source software for reliable, scalable, distributed computing