I contributed to many open source projects. Especially I focused to Windows related features. I use C/C++, Go, Java, C#, Perl, Python, Ruby, and Vim script, many programming languages because I love programming and especially Vim. I wrote many patches of Vim. Recently I implemented: terminal feature, sound APIs, job&channel of Vim on Windows. About 20 years ago, there were few Japanese contributors. When me and my friend started "vim-jp" organization 8 years ago, Japanese contributors grown over 20 developers. I hope that Go will become as same as Vim for Japanese developers. I'm long time Go user and contributor, author of many Go tools and database drivers. go-sqlite3 is used for many Go developers. I wrote many patches for standard packages when Go was still a young version. I wrote blog entries, and book about Go. 10 years ago, there were no Japanese companies using Go in production. But now, many Japanese companies now use Go. Next, I hope that Go will be used for education.