After the probably first Mainnet Lightning Network transaction to ever have happened, spawned hundreds of nodes running on mainnet even though it is still unsafe to use Lightning Network as it is yet to be tested. These are the brave fellows willing to take the risk to carve the path to innovation.
Lightning Network Explorer
Recksplorer, a Lightning Network Explorer, shows the number of Lightning Network nodes on the bitcoin mainnet. As of moment it shows 232 nodes are connected.
Lightning Wallet
A lightning wallet called Zap is already in the works but not yet released. You may visit their website and go to the bottom to subscribed to their mailing list to get updates especially when the wallet is released. You may also follow them on Twitter.
Subscribe form looks like below, you can find on the bottom of https://zap.jackmallers.com/:
Create your own Lightning Network store
Blockstream tweeted about their release of LightningCharge, a plugin to their c-lightning,as a way to make your own Bitcoin Lightning store.