Hi.
I am the maker of SpadeEye and there is no freeware or opensource tableselection tool available.
I play fixed limit shorthanded and what i do - when doing tableselection - is simply to search for e.g. tables with at least 2 player with a VPIP>40.
But all this values depends on what struct and stake your are playing and what type of oppenent you prefer
(preflop loose or postflop passive and so on...).
Simply try to find the tables with the opponent type you prefer.
A tableselection tool like SpadeEye helps to find such tables. It saves time and nerves...