The book "Networked Systems" presents the revised selected contributions from the second International Conference on Networked Systems, NETYS 2014, which took place in May 2014 in Marrakech, Morocco. It includes 20 full papers and 6 short papers, carefully selected from a total of 80 submissions. The topics covered are diverse, ranging from multi-core architectures to concurrent and distributed algorithms, as well as middleware environments. Additionally, it addresses memory clusters, social networks, peer-to-peer networks, sensor and mobile networks, as well as measures for privacy protection and security in networked systems. The contributions provide valuable insights into current challenges and developments in the field of network technologies.