Peercoin has its V0.5 update coming out in a couple of weeks time. This will have security updates and allows for data transactions on the blockchain. Sadly cold minting wont come until V0.6 which is still some time away. Regardless of this peercoin dev posts updates every week and the code is actively maintained. I think peercoin is a solid coin that could make it one day.
NuBits. PPC is related, so yes solid. Might pump up just for the Custodians to realize some cash for their effords.
Just for comparisons, LTC has nothing going for it.