Eco glosses use natural ingredients to create superb gloss and eggshell / satin finishes and these give similar results to conventional paints, however, there are some fundamental differences that you need to know about. On the plus side, they are of course much more environmentally friendly and much healthier to apply. VOCs that are emitted come from natural oils like orange and linseed, so nature can deal with these easily. Water based glosses are also available. These are quicker drying but are not so good as external finishes, so there is balance to be struck between drying times, longevity and type of finish required. for guidance the Eco Home Centre would recommend:
Auro 935 for pre-painted external finishes
Osmo White Gloss for untreated wooden windows
Osmo Country Colour for untreated wood
EarthBorn ProAqua for quick drying applications
For most internal gloss work, Green Paints, Osmo Wood Wax, earthBorn ProAqua and Auro 250 and 260 are all excellent options.