Open data are freely accessible online, available to be reused. They can be used for the development of applications which improve citizens' lives. A way to boost the development of innovative applications is by hosting hackathons, workshops, and conferences. Apparently, as far as entrepreneurship, open data impact economic growth, innovation, empowerment, and new or improved products and services. There is limited previous research not only on what motivates the developers to participate in open data competitions, but also on the benefits and challenges which are caused from the use of open data. Furthermore, researches focus on factors that affect nascent entrepreneurs' decisions to create a startup, but research in the field of open data and hackathons are limited. The purpose of this chapter is to present a theoretical framework in order to examine the impact of motivations, benefits, and barriers of the use of open data in the participation in hackathons and to develop a startup based on their applications.