OpenIV is a multi-purpose editor and archive manager created by the OpenIV Team for RAGE engine-based games like Grand Theft Auto 4 and 5, Max Payne 3, and Red Dead Redemption 2. The application's ...

The video uploaded to YouTube by GTA-Modding.com is from August and the mod has been updated since then, but it shows how you can fly around with freecam and spawn objects from a list.