Several simple command line tools, written in Go (golang). Combined in a single git project. Have a look. To build the tool, unless stated otherwise, use go's standard procedure in the tools subdir: go get/build/install.
To see what each thing does, I'm afraid you have to look at the code. The only command that has significant complexity currently, is the web server based Mandelbrot set explorer mandel.
cd <tool>
go get -v && go install -vcd <tool>
go get && go install