Information of the non-stellar content of Gaia DR3 can be found in Section 11.3.14 and Section 11.3.13 of the present documentation. Methods, results and performance of the DSC, OA, TGE, UGC and QSOC modules are detailed in Delchambre et al. (2023) and are studied from a cross-CU perspective in (Gaia Collaboration et al. 2023b).