Bitcoin Testnet LN
As of 2019-02, the Bitcoin Testnet Lightning Network has about 300 active nodes:
1ML indexes node and channel information for the Bitcoin Testnet:
1ML - Lightning Network Search and Analysis Engine - Bitcoin testnet

Several apps are live on the BTC Testnet:
Starblocks | Spend bitcoin with LN on TESTNET
Y'alls: Lightning Network powered publishing.
CoinGate Shop Demo
Blockstream Satellite Client
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