Libre has an active testnet with a faucet and replications of many apps and smart contracts.
API endpoint monitoring and list available here from antelope tools.
Create Libre testnet accounts and get Libre testnet LIBRE coins.
Antelope Tools network monitor real-time infrastructure data for multiple Antelope and EOSIO chains.
Libre Testnet Faucet and Account Creator
Join the validator / developer chat on Telegram.
The monitors track whether or not validators miss blocks along with other helpful data about the chain.