First, I am fully aware that there is no point in cheating an open source game so please don't start flaming...I coded this in the first place for my kids who find the single player player game way too hard to play.
Here is an http://www.titanium.hr/other/FreeCivSaveFileEditor.rar archive containing one exe and one dll.
There is no installer, just extract the archive into a folder and start the exe.
Currently only the gold and research are editable.
Upon save, no *.sav files are overwritten, instead a new uncompressed sav file is created e.g. freeciv-T0002-Y-3900-auto-edited.sav
Please don't bother me with stupid questions.
If you are afraid of downloading archived exe files do not download it or get yourself an anti virus!