The hidden gem anon coin is... Anoncoin itself ($ANC). Market cap is only $10mil. The coin's foundation is strong but major development is also coming.  It was established in 2013, working with the creator of IP2d (something Monero is still trying to implement).

The OG dev is active again and has built a full team of privsec developers. They are working on adding stealth addresses and ring signatures now. This is the real deal and Anoncoin could rival the best privacy coins.

The community is growing, new exchanges are coming and market makers are accumulating.