Visual Studio 2017 offline installer
Currently there seems to be no offline installer for the newly released Visual Studio 2017 but creating one is as easy as downloading all features and then packaging them into a .iso file yourself using one of the many existing free burning tools such as InfraRecorder.
To download all features and languages into a local folder run the Visual Studio 2017 installer that you can download from here or, if you own a MSDN subscription, from MSDN Subscriber Downloads with a
--layout x:\FolderName switch where
x:\FolderName is the folder path where you want downloaded files to land.
For further details you can read "Create an offline installation of Visual Studio 2017".