This application (software) enables you to upload/download some Sims 4 Content (houses, lots, Sims or rooms) from/into your library. If, like me, you get a little confused when packaging Sims 4 stuff, this software does it automatically. You can even see item details, such as the furnished and unfurnished prices of properties. You can also choose to package your stuff either with our without custom content.

Cost: Free

Offsite download link(s):
https://luniversims.com/files/file/73-sims-4-tray-importer/