Qiita Advent Calendar is an annual December event on Qiita (Japan's major developer-blogging platform) where programmers collaboratively fill themed "calendars" with a tech article for each day from December 1st to 25th.
The Tokyo Open Data Community is a Tokyo Metropolitan Government-run community that connects open-data users, civic technologists, startups, academics, with each other and with the city, to surface data needs, share reuse examples, and spur services built on Tokyo's open data.
Civic tech prototype development contest for students and youth under 22 (since 2020)
Urban Data Challenge (UDC) is a long-running (since 2013) national Japanese open-data initiative that pairs an annual public contest, awarding data-driven solutions to local problems, with a nationwide network of "regional hubs" building local data-utilization communities across Japan.
Hosted by code4japan, and held online on the fourth Saturday of each month, this is a collaborative space where anyone can bring ideas for social issues or community improvement, recruit team members, and co-create prototypes and services.
Group in Mobara, Chiba; promotes citizen action through dialogue games like SIM Mobara 2030.
Citizen-led support visualization and volunteer matching efforts for the 2024 Noto Peninsula earthquake.
Code for OSAKA is a civic-tech community group in Osaka, Japan, that holds regular meetups to tackle local problems with IT and to support citizen activities.
IT developer community founded in 2011 to support recovery from the Great East Japan Earthquake.