| archive/tar | Package tar implements access to tar archives. |
| compress/gzip | Package gzip implements reading and writing of gzip format compressed files, as specified in RFC 1952. |
| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| flag | Package flag implements command-line flag parsing. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/appc/spec/aci | Package aci contains various functions for working with App Container Images. |
| github.com/appc/spec/discovery | Package discovery contains an experimental implementation of the Image Discovery section of the appc specification. |
| github.com/appc/spec/schema | Package schema provides definitions for the JSON schema of the different manifests in the App Container Specification. |
| github.com/appc/spec/schema/types | Package types contains structs representing the various types in the app container specification. |
| io | Package io provides basic interfaces to I/O primitives. |
| io/ioutil | Package ioutil implements some I/O utility functions. |
| net/url | Package url parses URLs and implements query escaping. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| path | Package path implements utility routines for manipulating slash-separated paths. |
| path/filepath | Package filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths. |
| runtime | Package runtime contains operations that interact with Go's runtime system, such as functions to control goroutines. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| text/tabwriter | Package tabwriter implements a write filter (tabwriter.Writer) that translates tabbed columns in input into properly aligned text. |
| text/template | Package template implements data-driven templates for generating textual output. |