are there any other coins that have a halving coming or who just have halvings like ltc and btc?
LTC halving is pretty new to me. I know BTC halved to BCH, but not too sure if LTC also halved. Maybe Ethereum will halve too in future to Constantinople.
That's not what halving is. Halving is the when the total Bitcoin distributed per block mined is cut in half. You're talking about a hard-fork.