DogeOS opened the public testnet for its Dogecoin application layer on Wednesday, according to its press release. Testnet fees are paid in DOGE, and a faucet provides 42.069 test DOGE per day. The release lists teams building lending, trading, stablecoin, prediction market and gaming apps. DogeOS runs as a separate layer rather than changing Dogecoin itself. The release gives no date for a mainnet launch.