Emercoin (EMC) is the mineable coin based on the Emercoin’s own blockchain. You can convert these coins to other cryptos and back on a few exchanges. Emercoin was launched as early as in 2013 as the Peercoin’s fork.
Dropil (DROP) is an Ethereum token and works as a utility token for the Dropil platform. No more Dropil tokens will ever be created, which is supposed to prevent further deflation. You can buy Dropil (DROP) for cryptos (for example, BTC or ETH) with some exchange platforms.
THETA (THETA) coin is the cryptocurrency of the streaming network powering the decentralized video delivery. THETA is listed on multiple Asian exchanges and can be purchased for the South Korean won. THETA can boast solid investors, including Samsung. Being originally an ERC20 token, THETA swapped to its own mainnet in March, 2019.