Comment by duskwuff

Go! wasn't even published as its own project [1] until 2015, well after Go(lang) was available. It previously existed as an unpublished CVS repository in an obscure Sourceforge project [2]; I can't fault the Go developers for ignoring or overlooking it. You can find a circa-2002 version of Go! in the archived CVS repository of the Sourceforge project, but none of the project's release files appear to contain it.

(Ignore the "Last Update: 2013-09-06" on the project page - that's the date that SourceForge performed an automatic migration. Any real activity on the project seems to have petered out around 2002, with one final file released in 2003.)

[1]: https://github.com/fgmccabe/go

[2]: https://sourceforge.net/projects/networkagent/