Ubuntu is well known for supporting blind users with Orcas which is a Debian based utility for keyboards and Linux support for braille is unsurpassed by proprietary operating systems. Most of the stable version Debian support visually handicapped users.
Along with this facility multi-language support is essential and many Linux distributions are only in English and some are only in French or Spanish.
But lately many distributions are supporting several languages. Debian is the leader in this and it now supports Sinhala too.
Third utility should go with this is virtual keyboard.
Often with the frequent use keys of the keyboard some of them get stuck and if this happens when entering a password one may not be able to get started which is a little embarrassment to say the least.
Virtual keyboard is value added utility.
All these must be bundled out in the accessibility corner.
I am not sure where the sweeper, the cleaning utility should be placed and I prefer it with the accessibility option. The sweeper removes unnecessary and temporary files and the history tree which tend to accumulate and get bigger and bigger in almost every Linux distribution.
Only in PCLinux I find the utility that removes temporary files at boot time which one can select at the time f installation.
Unlike servers where every data and every little movement are necessary for recovery purposes when a servers fails but all these details of history tree are not necessary even though very valuable when break into a system is suspected for a desktop.
Archiving utilities are universal in Linux distributions and if one uses them judiciously may be able to save disk space.
In my case it is not the hard disk (which I format once a year) that I use but CD and DVDs and burner utility either K3B or Brasso is essential for this purpose.
So I have lumped all the good housekeeping utilities in one category which are useful if one is using one computer for all the day to day activities.