Creates a symlinked version of a Unity project so you can easily do network development. Add script to Editor folder. Run from "Utils/Create Symlink Project" then choose directory to put symlink'd project in.

CreateSymlinkProject.cs

using UnityEngine;
using UnityEditor;
using System.Diagnostics;

public class CreateSymlinkProject {

    [MenuItem("Utils/Create Symlink Project")]
    static void DoIt()
    {
        string folderName = EditorUtility.SaveFolderPanel("Symlink Project Location", "", "");

        string newAssetFolder = folderName + "/Assets";
        string currentAssetFolder = Application.dataPath;

        string newProjectSettingsFolder = folderName + "/ProjectSettings";
        string currentProjectSettingsFolder = Application.dataPath.Replace("Assets", "ProjectSettings");

        string newPackagesFolder = folderName + "/Packages";
        string currentPackagesFolder = Application.dataPath.Replace("Assets", "Packages");

        CreateSymlink(newAssetFolder, currentAssetFolder);
        CreateSymlink(newProjectSettingsFolder, currentProjectSettingsFolder);

        CreateSymlink(newPackagesFolder, currentPackagesFolder);


    }

    static void CreateSymlink(string newFolder, string linkFolder)
    {
        Process.Start("cmd.exe", "/c mklink /D \"" + newFolder + "\" \"" + linkFolder + "\"");
    }
}

Super useful, thanks.
For mac or linux:

	static void CreateSymlink(string newFolder, string linkFolder)
	{
		if (Application.platform == RuntimePlatform.WindowsEditor)
		{
			Process.Start ( "cmd.exe", "/c mklink /D \"" + newFolder + "\" \"" + linkFolder + "\"" );
		}
		else if (  Application.platform == RuntimePlatform.OSXEditor
   				|| Application.platform == RuntimePlatform.LinuxEditor )
		{
			Process.Start ( "ln", "-s \"" + linkFolder + "\" \"" + newFolder + "\"" );
		}
	}

Thanks for this script!

Had some issues getting it to run on my computer though. Worked fine after manually opening cmd as administrator and running the cmds.