If you understand that they seem to be written as a learning exercises by the respective authors, I found that there's a good introduction to the nuts and bolts

If you understand that they seem to be written as a learning exercises by the respective authors, I found that there's a good introduction to the nuts and bolts to be had browsing attempts at creating userspace tools in go: eg. https://bitbucket.org/telesto/goblin/ https://bitbucket.org/telesto/goblin/ or https://github.com/manveru/goblin https://github.com/manveru/goblin .. it seems to be a popular first project :)