I didn't read the whole thread, but in case FIMK (pure PoS) has not been mentioned yet: http://fimk.fi/en/info.html

PS: the basic development philosophy of FIMK may be quite different from the other ones mentioned, as the main development interest and effort is in the communal aspect and every day use - gradual distribution of third of the coins to Finnish citizens as "basic income" over five years, the same time as extra stake rewards are being paid, in gradually lowering curve.