You can suggest multiple apps for each category but you must list them in order of preference (e.g., Web Browser: Chromium, Vivaldi, Lynx).
You can suggest non-free and non-open source software, but you must note this in your list (e.g,, Web Browser: Vivaldi, non-free)
If you no-longer use a desktop app for a given category, list what you do use. (E.g., Email Client: Gmail-web)
Finally if don’t have a preference for a category you can simply skip it.