• GO111MODULE
• dep tool
• GO15VENDOREXPERIMENT
• Pkg copy, built using GOPATH modification, supports fetching specific version
• Pkg copy, build using GOPATH modification
• Revision Locking
• Pkg copy with import path re-write (As of Go 1.5, this is no longer the recommended practice)
• Vendor Utilities
• Import Proxies
• Go Version Managers
• Client App Test Packages
• Abandoned Tools
• Not Written in Go