Download manager package for Go (program)

 Downloading the internet, one goroutine at a time!
 .
 Grab is a Go package for downloading files from the internet with the
 following rad features:
  - Monitor download progress concurrently
  - Auto-resume incomplete downloads
  - Guess filename from content header or URL path
  - Safely cancel downloads using context.Context
  - Validate downloads using checksums
  - Download batches of files concurrently
  - Apply rate limiters
 .
 This package contains the grab program.