Plecos is a Python tool to check metadata (a JSON file) to see if it conforms to the [OEP-8 schema](https://github.com/oceanprotocol/OEPs/tree/master/8). It wraps the [jsonschema](https://github.com/Julian/jsonschema) validator. Aquarius uses Plecos for checking metadata and other Ocean Protocol software will probably use it in the future.
The [Ocean Protocol Faucet Server](https://github.com/oceanprotocol/faucet) is a microservice that allows users to request Ether for a particular Ethereum network (e.g. the Nile Testnet).
Submarine is based on [BlockScout](https://github.com/poanetwork/blockscout) (by [POA](https://poa.network/)), an open source blockchain explorer for EVM-based blockchain networks.
There is an [Ocean Protocol fork of BlockScout](https://github.com/oceanprotocol/blockscout). An instance is deployed in the Nile Testnet at [https://submarine.dev-ocean.com/](https://submarine.dev-ocean.com/).
There are a few Ocean Protocol command-line interfaces (CLIs). All of them were under development at the time of writing, so you may have issues with using them.
- [tuna](https://github.com/oceanprotocol/tuna) can help you use squid-py, squid-js or squid-java from the command line
- [ocean-cli](https://github.com/bigchaindb-gmbh/ocean-cli) was built using squid-java
- [ocean-cli-py](https://github.com/bigchaindb-gmbh/ocean-cli-py) was built using squid-py
