I wanted something which is not online, so I can use it even if I am not connected. So, I have bought DietPower. This is a very efficient soft but its food catalog is really tailored for the US citizens and I must introduce many foods manually. Also, it is initially conceived for US measure system (but they are including the metric system and you can use it for logging food and activities). Moreover, it does not export at all the data and it has only some graphical analysis capabilities, very limited indeed. It is not free either. But it is quite powerful otherwise and has a large database (larger than FigWee after some small experiments with this, following Kate's advice. I am continuing my tests and maybe will ask for the Money-back guarantee if I do not get used to it.
I have not been able to discover any good European food based system or website yet. If you know any, I would be happy to experiment it.