Lightning nodes that run popular Lightning apps and services
These nodes have lots of channels funded with lots of bitcoin. Nodes that also host Lightning Network apps and services have a strong incentive to have good uptime and will tend to have larger volumes of inbound payments, so their channels with other nodes will tend to have both sending and receiving capacity. Connect to them and you can route payments through them to large swathes of the Lightning Network graph. See the 1ML list by capacity for other large nodes.
Note that without additional information, it is not possible to know whether a node is actually run by the individual or company that it is named after—anyone can name a node anything. A representative can prove that they control a particular Lightning node by signing a message with the private key that corresponds to the node's public key, e.g. in LND with lncli signmessage <message>.
Y'alls is a Lightning-powered forum run by Alex Bosworth, an engineer at Lightning Labs.
This node is a large-volume and high-uptime Eclair node run by ACINQ, the creators of the Eclair node software. This node is the default connection recommended to Eclair Mobile users. If you are able to establish receiving capacity from this node, you will have a short path to reliably receive payments from many Eclair Mobile users.
LNBIG is an unknown entity that has set up dozens of Lightning Network nodes and used dozens of bitcoin to fund thousands of channels across the Lightning Network. You will notice several LNBIG nodes on the list of top capacity nodes. The owner of LNBIG, as verified by a messaged signed by an LNBIG node key, sometimes posts messages in the Y'alls forum. Because LNBIG doesn't offer any services, its channels tend to all be outgoing and unbalanced. Whether you want to connect to this entity is up to you—they cannot steal Bitcoin in your Lightning channels, but their identity and intentions are unknown and they are a source of centralization in the Lightning Network.