I did a quick calculation of what are the most imported packages.
10 github.com/gorilla/mux
9 golang.org/x/net/context
7 golang.org/x/oauth2
7 github.com/gorilla/websocket
6 github.com/spf13/cobra
6 github.com/lib/pq
6 github.com/gin-gonic/gin
6 github.com/codegangsta/cli
5 golang.org/x/net/websocket
5 github.com/yaml.v2
5 github.com/julienschmidt/httprouter
5 github.com/google/go-github/github
4 github.com/go-sql-driver/mysql
4 github.com/fatih/color
4 github.com/dgrijalva/jwt-go
4 github.com/codegangsta/negroni
4 github.com/boltdb/bolt
4 github.com/PuerkitoBio/goquery
4 github.com/BurntSushi/toml
3 golang.org/x/crypto/bcrypt
4 github.com/stretchr/testify/assert
3 github.com/smartystreets/goconvey/convey
2 golang.org/x/net/context
2 github.com/stretchr/testify/require
1 zombiezen.com/go/capnproto2
1 google.golang.org/grpc/benchmark/stats
1 google.golang.org/grpc/benchmark/grpc_testing
1 google.golang.org/grpc
1 golang.org/x/net/http2/hpack
1 github.com/xeipuuv/gojsonschema
1 github.com/stretchr/testify/suite
1 github.com/stretchr/testify.v1/require
1 github.com/stretchr/testify.v1/assert
1 github.com/spf13/afero
1 github.com/satori/go.uuid
1 github.com/pborman/uuid
1 github.com/miolini/water
1 github.com/manveru/faker
1 github.com/google/go-github/github
1 github.com/golang/protobuf/proto/proto3_proto