Here I would like to present a small app - BioFileConverter for Mac users. This app can be very useful for the conversion of a large number of .xdna (SerialCloner or DNA Strider) and .dna (SnapGene) files into genbank .gb files at once. BioFileConverter also converts .abi/ab1, .fastq and fasta files into txt files without any description line, just clean DNA/Protein sequence.
Here is the link to the BioFileConverter in Mac AppStore - https://apps.apple.com/app/id1583923246
If some Mac user needs more options for the files conversion, please let me know here.