Storm (STORM) is an ERC-20 fuel token of the eponymous platform, which works as the freelancer marketplace. The token is listed by a number of exchanges.
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.