This is an FTP client started as a port of the standard Python FTP client library
Forked form code.google.com/p/ftp4go and change some dependenes of the package

go get github.com/shenshouer/ftp4go

Import the library in your code and call the methods exposed by the FTP structure, for instance:

package main  
import (
  "fmt"
  "os"
  ftp4go "github.com/shenshouer/ftp4go"
)  
func main() {
  ftpClient := ftp4go.NewFTP(0) // 1 for debugging
  //connect
  _, err := ftpClient.Connect("myFtpAddress", ftp4go.DefaultFtpPort)
  if err != nil {
    fmt.Println("The connection failed")
    os.Exit(1)
  }   
  defer ftpClient.Quit()
  _, err = ftpClient.Login("myUsername", "myPassword", "")
  if err != nil {
    fmt.Println("The login failed")
    os.Exit(1)
  }      
  //Print the current working directory
  var cwd string
  cwd, err = ftpClient.Pwd()
  if err != nil {
    fmt.Println("The Pwd command failed")
    os.Exit(1)
  }
  fmt.Println("The current folder is", cwd)
}

package main

import (
	ftp4go "github.com/shenshouer/ftp4go"
	"fmt"
	"os"
)

var(
	downloadFileName 	= "DockerToolbox-1.8.2a.pkg"
	BASE_FTP_PATH 		= "/home/bob/"					// base data path in ftp server
)

func main() {
	ftpClient := ftp4go.NewFTP(0) // 1 for debugging

	//connect
	_, err := ftpClient.Connect("172.8.4.101", ftp4go.DefaultFtpPort, "")
	if err != nil {
		fmt.Println("The connection failed")
		os.Exit(1)
	}
	defer ftpClient.Quit()

	_, err = ftpClient.Login("bob", "p@ssw0rd", "")
	if err != nil {
		fmt.Println("The login failed")
		os.Exit(1)
	}

	//Print the current working directory
	var cwd string
	cwd, err = ftpClient.Pwd()
	if err != nil {
		fmt.Println("The Pwd command failed")
		os.Exit(1)
	}
	fmt.Println("The current folder is", cwd)


	// get the remote file size
	size, err := ftpClient.Size("/home/bob/"+downloadFileName)
	if err != nil {
		fmt.Println("The Pwd command failed")
		os.Exit(1)
	}
	fmt.Println("size ", size)

	// start resume file download
	if err = ftpClient.DownloadResumeFile("/home/bob/"+downloadFileName, "/Users/goyoo/ftptest/"+downloadFileName, false); err != nil{
		panic(err)
	}

}

Being a port of a Python library, the original Python version is probably the best reference.
Python ftplib

Some new methods have been implemented to upload and download files, recursively in a folder as well.

• TLS is not supported yet
• add multi goroutine for one download task support