Someone who has assets that they want to sell (or give away freely). An example is an almond distributor with 30 years of data about almond sales.
## Consumer
Someone who wants assets. An example is a data scientist working at an economic think tank.
## Marketplace
A service where publishers can list what assets they have, and consumers can see what's available then buy it (or get it for free).
## Keeper
A computer running a blockchain client (i.e. a blockchain node) where the associated blockchain network is running the Ocean Protocol keeper contracts (smart contracts).
## Aquarius
Ocean-specific software to help store and manage metadata about assets (but not assets themselves). Every marketplace must run an instance of Aquarius.
## Brizo
Ocean-specific software to help publishers manage consumer access to their assets.
A set of software libraries to interact with Ocean network participants, including Keepers, Aquarius, Brizo, and Secret Store. The initial libraries are in Python, JavaScript and Java.
## Pleuston
An example marketplace frontend implemented using React and Squid-JavaScript.
