No need for a special tool, a good crack with a lump hammer where the taper fits will normally free off the ball joint although if you do want one of those ball joint splitters they are readily available at any local factors or Halfords etc., they are not Land rover specific and will be much cheaper elsewhere. Readily available on fleebay too.

Standard practice for ARB drop links is just cut em off.
Only special tool needed is of the angle grinder variety.