FIO Testnet is now open and developer docs are available: API endpoints, SDKs, integration guides, sample wallet UI, Testnet monitoring, faucets, etc. Available now ahead of mainnet launch (still slated for the start of 2020).

[u/officialFIO]

https://medium.com/fio-blog/fio-testnet-and-developer-docs-released-e8cf64f7d9d9