not sure that it's relevant and 'large' is subjective, but yes, i stewarded the technology migration of a core product suite for a prior employer, which incidentally had government agencies as a prominent customer segment.

i'm not suggesting that governments can only use internally developed or open-source software, i'm saying corporate interests should be firewalled away from goverment. so a locally-installed office suite incorporating no surveillance tech doesn't have the ancillary corporate interests attached to qualify it for being firewalled.