I am not a professional so this is merely me finding new things that I think people would like to check out.
I don’t have iOS and/or Mac, nor do I desire to have one. So if you want to find alternatives to the apps listed here, go to this handy site. It will give you a comprehensive list of alternatives across platforms.
If you think a link is broken, please drop a comment <3.
If you would like to add an entry, please drop a comment. Credits will be given <3.