Nave
Virtual Environments for Node
nave is a lightweight Node.js version manager that treats each Node installation as its own “virtual environment,” including a separate global npm space. You can install specific versions (or tip builds), create named environments, and switch between them with a single command. By default it launches a subshell, so exiting the environment is as simple as exit or Ctrl-D, and you don’t have to modify your shell startup files to get going.