This book offers a cross-national comparison of open data policies in Estonia and Kazakhstan. By analyzing a broad range of open data-driven projects and startups in both countries, it reveals the potential that open data phenomena hold with regard to promoting public sector innovations. The book addresses various political and socioeconomic contexts in these two transitional societies, and reviews the strategies and tactics adopted by policymakers and stakeholders to identify drivers of and obstacles to the implementation of open data innovations. Given its scope, the book will appeal to scholars, policymakers, e-government practitioners and open data entrepreneurs interested in implementing and evaluating open data-driven public sector projects.