These packages are part of the Go Project but outside the main Go tree.
They are developed under looser compatibility requirements than the Go core.
Install them with “go get”.
[docs] [source] golang.org/x/tools — godoc, vet, cover, and other tools.
[docs] [source] golang.org/x/mobile — libraries and build tools for Go on Android.
[docs] [source] golang.org/x/crypto — additional cryptography packages.
[docs] [source] golang.org/x/image — additional imaging packages.
[docs] [source] golang.org/x/net — additional networking packages.
[docs] [source] golang.org/x/sys — for low-level interactions with the operating system.
[docs] [source] golang.org/x/text — packages for working with text.
[docs] [source] golang.org/x/blog — the content and server program for blog.golang.org.
[docs] [source] golang.org/x/review — tools for code review.
[docs] [source] golang.org/x/exp — experimental code (handle with care).