You may try BioEdit with Wine - I have used many years ago and it worked, should still work with more recent versions of Wine.
You may also try VIM with DNA syntax highlight (I never tried, as I have a serious VIM trauma: the first time I used VIM, without graphical interface, I could not exit it and had to reboot my computer).
Another one I never used - but it looks pretty - is JalView.
I use SeaView, I like its simplicity and bundled applications, although editing fasta is really awkward,.
You may try some paid software, like Geneious.