Transactions and wallet addresses on a public blockchain can be viewed using a blockchain explorer.
Since blocks of data on the chain are shared by numerous computers on the network, the data including transactions, sender and receiver wallet addresses, time, and date are also available for public access using explorers, many of which are open source or provided by third parties.
A notable blockchain explorer is Etherscan which can be used to monitor transactions on the Ethereum blockchain. Enter a wallet ID or transaction ID or contract address in the search bar for results.
A google search for LTC explorer or ZEC explorer will yield multiple results for user-friendly explorers of those blockchains.