There is not a language as batteries-included as Go, that I've found. The standard lib includes almost everything, including an excellent HTTP server and client (even an HTTP proxy), a test framework, JSON/XML/CSV libs, SQL driver, CLI parser, a template library, crypto, etc. The "go" command includes tooling like a package manager, unit test runner, code formatter, static analyzer, race condition checker, code coverage, profiler, cross-compiler, etc.

I don't know what you mean by "memory-management-free" though, Go is still a garbage collected language.