| These packages are part of the Go Project but outside the main Go tree. |
| They are developed under looser [compatibility requirements](http://golang.org/doc/go1compat.html) than the Go core. In general, they will support the previous two releases and tip. |
| Install them with "go get". |
| * [[docs](https://godoc.org/golang.org/x/tools)] [[source](https://go.googlesource.com/tools)] ` golang.org/x/tools ` — godoc, vet, cover, and other tools. |
| * [[docs](https://godoc.org/golang.org/x/mobile)] [[source](https://go.googlesource.com/mobile)] ` golang.org/x/mobile ` — libraries and build tools for Go on Android. |
| * [[docs](https://godoc.org/golang.org/x/crypto)] [[source](https://go.googlesource.com/crypto)] ` golang.org/x/crypto ` — additional cryptography packages. |
| * [[docs](https://godoc.org/golang.org/x/image)] [[source](https://go.googlesource.com/image)] ` golang.org/x/image ` — additional imaging packages. |
| * [[docs](https://godoc.org/golang.org/x/net)] [[source](https://go.googlesource.com/net)] ` golang.org/x/net ` — additional networking packages. |
| * [[docs](https://godoc.org/golang.org/x/sys)] [[source](https://go.googlesource.com/sys)] ` golang.org/x/sys ` — for low-level interactions with the operating system. |
| * [[docs](https://godoc.org/golang.org/x/text)] [[source](https://go.googlesource.com/text)] ` golang.org/x/text ` — packages for working with text. |
| * [[docs](https://godoc.org/golang.org/x/blog)] [[source](https://go.googlesource.com/blog)] ` golang.org/x/blog ` — the content and server program for [blog.golang.org](http://blog.golang.org). |
| * [[docs](https://godoc.org/golang.org/x/review)] [[source](https://go.googlesource.com/review)] ` golang.org/x/review ` — tools for code review. |
| * [[docs](https://godoc.org/golang.org/x/benchmarks)] [[source](https://go.googlesource.com/benchmarks)] ` golang.org/x/benchmarks ` |
| * [[docs](https://godoc.org/golang.org/x/exp)] [[source](https://go.googlesource.com/exp)] ` golang.org/x/exp ` — experimental code (handle with care). |
| [List of all packages in sub-repositories](https://godoc.org/-/subrepo) |
