Amazon EMR - Amazon Elastic MapReduce is a web service that makes it easy to quickly process vast amounts of data.
Quantopian - Your algorithmic investing platform
Hortonworks - Hadoop-Related
quantra - A public API for quantitative finance made with Quantlib
IBM Analytics Engine - Analytics Engine is a combined Apache Spark and Apache Hadoop service for creating analytics applications.
Pandas - Pandas is an open source library providing high-performance, easy-to-use data structures and data analysis tools for the Python.