Command gopkgs list your installed Go packages for import.
$ go get github.com/tpng/gopkgs
It aims to provide a faster alternative to "go list all" to list available packages for import.
It is extracted from the margo import paths function (https://github.com/DisposaBoy/GoSublime/blob/master/src/gosubli.me/margo/m_import_paths.go) bundled in GoSublime.