Computer Software Association of Japan (CSAJ)
- CSAJ (formerly JPSA) is a non-profit organization which has about 350 software developers, publishers, system integrators, distributors, dealers and its related support service providers.
- http://www.csaj.jp/english/index_e.html

Japan Information Processing Development Corporation
- Promotes IT infrastructure and electronic commerce, trains IT engineers, and promotes IT development.
- http://www.jipdec.jp/eng/

Japan Information Service Industry Association (JISA)
- Aims to improve the value of software services, enhance informatization, and actively accommodate and support the needs of members.
- http://www.jisa.or.jp/

The Japan CS Partnership
- A government/industrial consortium, with distributed laboratories focused on several long-term research areas in computer science.
- http://www.cs.arizona.edu/japan/www/

Communications and Information Network Association of Japan
- Advance and promote changes toward advanced communication through multimedia. In English and Japanese.
- http://www.ciaj.or.jp/

Software Information Center (SOFTIC)
- A non-profit foundation with the missions of promoting the improvement of infrastructure for information technology (IT) and aiming for the development of an advanced IT society that will contribute to the development of the industry, economy and culture
- http://www.softic.or.jp/

International Information Science Foundation
- Assists researchers or graduate students in the field of information science for international exchanges and conferences.
- http://www.iisf.or.jp/

Kanto Computer Calendar
- Event listing for English language computer club meetings as well as computer, internet, and telecommunications exhibitions in the Tokyo area.
- http://www.onjapan.net/cgi-bin/calendar.cgi

Japanese Society for Artificial Intelligence
- The academic society for Artificial Intelligence Research in Japan. Information about online transactions and the announcement mailing-list is available on this site.
- http://www.ai-gakkai.or.jp/jsai/english.html

Digital Eve Japan
- Non-profit organization for women of all backgrounds and abilities to reach their goals through new technology.
- http://www.digitalevejapan.org/

Japan Network Operator's Group
- JNOG is an operational forum for coordination of network operations in Japan. Japan affilate of North American Network Operators Group.
- http://www.janog.gr.jp/index-e.html

Japan Linux Association
- Homepage of Japan Linux users and webmasters to solve problems and promote Linux.
- http://www.linux.or.jp/en/index.html

DPC
- Database Promotion Center, Japan
- http://www.dpc.or.jp/

INTAP
- Interoperability, Technology Association for Information Processing.
- http://www.intap.or.jp/index.html

New Media Development Association
- Government affiliated association for the advancement of new media and applications of new media. In Japanese and English.
- http://www.nmda.or.jp/

CODE-J Content Developers of Japan
- A non-profit organization where content developers in Japan can exchange ideas, and network on both professional and social levels. In English and Japanese.
- http://www.codej.org/