The document summarizes how various companies are using Apache Flink based on presentations given at the inaugural Flink Forward 2015 conference. It highlights use cases from Ericsson Research, Bouygues Telecom, Capital One, Amadeus, Otto Group, Research Gate, and Eura Nova, showing how each company is utilizing Flink for applications such as real-time analytics, machine learning algorithms, and various parts of data analysis pipelines. The document also provides website links for additional information on Flink Forward 2015 talks and videos.