Franciscan Third Orders
Greccio Fraternity of Secular Franciscans
Franciscan Friars, Third Order Regular

Opus Dei
Opus Dei -- "The Work of God" -- is an organization founded by Bl. (soon to be St.) Josemaria Escravia. It was founded primarily for laymen (though secular priests are also members) and was created specifically to help people live religious lives in the world.
Official Opus Dei page (US).