DNS
DNS with built-in caching and configurable ad/privacy blocking. The cache is replicated across all instances in a cluster, further increasing its effectiveness. Migration is also made very easy as Gravity can be setup as forwarder to forward requests to an existing DNS server, while also adding the records to its own database.
DHCP
DHCP with automatic DNS registration, and as with the other features, full replication to all cluster members. Gravity can also import DHCP leases and reservations from Microsoft's DHCP server. Additionally, Gravity allows you to send WOL signals to devices right from its UI.
Metrics
Everyone loves graphs. Gravity keeps its own metrics for all instances in a cluster, giving you an insight into the load and what clients are doing without requiring any extra setup.