Orbit allows you already to export to many "standard" formats. However, it uses also its own file formats with some advantages over the non-native ones. These would be Orbit Vector File .ovf, Orbit Vector Tiles .ovt and Orbit XML File .oxf:
You can find more information on these formats on the Orbit Knowledge Base:
https://orbitgt.com/kb/technology/supported_formats/index?s%5b%5d=vector
Note: there is already an FME extension for Orbit: https://orbitgt.com/kb/technology/supported_formats/vector/fme