The submitted link might be better changed to the actual release notes: https://gitlab.isc.org/isc-projects/kea/-/wikis/Release-Note... which start with this information.

As others have said, Kea is a DHCP server.

More than that, it is an ISC project, is the successor to ISC DHCP (now end-of-life & unsupported for a few years), and weirdly started out as part of BIND 10.

Ref: https://www.isc.org/dhcphistory/#the-kea-dhcp-server

(And I vaguely recall it's used as the DHCP component in a few other things, like maybe Infoblox).

I was wondering that too. A DHCP server, apparently: https://www.isc.org/kea/

(This is one place where I think a little editorializing to the page title to add context would be helpful.)

A DHCP server for those who are wondering

Won't take long, ISC doesn't do 'much' but they do it well

Next gen reference DHCP server. IIRC it's new thing is IPv6 support.

DHCP server?