Bundy is a rewrite of the BIND DNS system that is designed for a lot more scalability and security than BIND9. It is more complex to configure than BIND9 and includes much more modularity.
A BIND9 instance normally has the following service running:
Bind9/named
Bundy has the following services:
bundy-auth — Authoritative DNS server. This process serves DNS requests.
bundy-cfgmgr — Configuration manager. This process maintains all of the configuration for Bundy.
bundy-cmdctl — Command and control service. This process allows external control of the Bundy system.
bundy-ddns — Dynamic DNS update service. This process is used to handle incoming DNS update requests to allow granted clients to update zones for which Bundy is serving as a primary server.
bundy-msgq — Message bus daemon. This process coordinates communication between all of the other Bundy processes.
bundy-resolver — Recursive name server. This process handles incoming DNS queries and provides answers from its cache or by recursively doing remote lookups. (This is an experimental proof of concept.)
bundy-sockcreator — Socket creator daemon. This process creates sockets used by network-listening Bundy processes.
bundy-stats — Statistics collection daemon. This process collects and reports statistics data.
bundy-stats-httpd — HTTP server for statistics reporting. This process reports statistics data in XML format over HTTP.
bundy-xfrin — Incoming zone transfer service. This process is used to transfer a new copy of a zone into Bundy, when acting as a secondary server.
bundy-xfrout — Outgoing zone transfer service. This process is used to handle transfer requests to send a local zone to a remote secondary server.
bundy-zonemgr— Secondary zone manager. This process keeps track of timers and other necessary information for Bundy to act as a slave server.
Additionally, Bind9 still includes the DHCP server in it's installation. This feature is no longer in Bundy (it's the one piece that the ISC held onto)
https://ripe68.ripe.net/presentations/208-The_Decline_and_Fall_of_BIND_10.pdf