OKCash is a Proof of Stake cryptocurrency that was released under the MIT licence.

WhiteCoin is a cryptocurrency protocol with a Proof-of-Stake (PoS) consensus mechanism. WhiteCoin's (XWC) marketing materials place an emphasis on security and stability, but do not present details regarding their specific technical advantages or project goals.
WhiteCoin's payment network provides a high degree of anonymity and its PoS consensus model allows XWC coin holders to earn revenue by staking their holdings.

Beetle Coin is a PoS cryptocurrency that places an emphasis on raising awareness and funds for environmental issues. The coin is traded and listed under the BEET symbol.