The National Diet Library (NDL) has been promoting utilizations of the data created and provided on the Internet by the NDL since it established its "Policy of providing databases created by the National Diet Library." The NDL provides bulk download of open datasets and takes part in public events related to open data and civic technology, which increased visibility of NDL data in communities throughout Japan. The NDL also organizes ideathons and hackathons to promote its data and services. These outreach activities resulted in any number of interesting and potentially useful initiatives. This presentation will demonstrate the NDL's efforts and achievements in promoting the use of its data, while showcasing some of the best civic-driven applications and visualizations of library data.