These projects are designed to help children get a head start in school and to facilitate parents access employment or training opportunities. There's music and arts and lot of time for play with toys. This gives them a good start for when they go to play-school or 'big school'.
These crèches create networks and opportunities for people to meet; otherwise people can be quite isolated. Children can fall behind quickly when they go to school if they haven't mixed with other kids and learned basic social skills so these centres provide those kinds of opportunities.