Power Ledger (POWR) is an ERC-20 compliant market token of the energy platform, that is listed by a number of exchanges. It can also be traded against the fiat currency on some of these platforms: for example, against USD on the LocalTrade exchange.
iExec RLC (RLC) is an ERC-20 compliant digital asset and used as a payment method for using the iExec network’s resources. RLC abbreviation stands for “runs on lots of computers”. A fair number of exchanges features RLS in its cryptocurrency pairs.
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.