Delphi 6 is pretty old, I know. Unfortunately there are reasons why I can't upgrade which I don't want to get into here.
My problem is that it's hard to read code. I have the Castalia plugin which helps a bit (parenthesis matching, shows blocks of if, else, end) but it doesn't highlight the syntax like other IDEs do (variables, constants, procedures, etc.) in different colors. It also doesn't show the IFDEF blocks which can be very confusing at times.
For Delphi 6 what plugins can do some or all of these features?