SnapGene can connect to the LabArchives ELN and Dotmatics Bioregister, see Exchange Files with the LabArchives ELN and Authenticate with Dotmatics Bioregister.
SnapGene does not have a public API and cannot be connected to other third party software or services.
SnapGene can be run from the command line to perform sequence format conversion or create sequence maps, see Command Line: Converting File Formats and Command Line: Creating Maps of DNA Sequences.