Did mention Groen!. But I didn't link the Wiki before. The spot I don't know.

Wiki mentions the following on the VLD:

Ideologically, the VLD started as a right-wing, somewhat Thatcherite party under its founder, Guy Verhofstadt. On economic issues the VLD rapidly became more centrist and gave up much of its free-market approach. Party chairman Bart Somers called in November 2006 for a "revolution" within the party, saying that "a liberal party," like the VLD, "can only be progressive and social."

I guess that how you rate the stance of a party depends to some extent on where you're coming from, but I don't think the Open VLD is a bunch of marketistas. Of course they are still more oriented towards the market than most European social democrats (as is also the case with the left wing of the Democratic party, or the British LibDems). I'd place them on the left rather than on the centre largely on the basis of their social agenda.