dhcpcd features

dhcpcd is the only open source DHCP client to support:-

•  DHCP over FireWire
•  User Class
•  SIP Servers
•  Domain Search
•  Classless Static Routes *
•  IPv4LL, APIPA or ZeroConf
•  Node-specific Client Identifiers
•  DHCP over InfiniBand
• Link carrier detection
• Wireless SSID profile support
• ARP ping profile support
• Dynamic route management for systems without metrics (ie, the BSDs)
• Exposes interface events and methods via DBus (using  dhcpcd-dbus)
• Small runtime, 60k on i386

If you think the above list is inaccurate, don't hesitate to edit it

Looking forward, I'd like to implement a  DHCP IPv6 stack.

Classless Static Routes

It should be noted that  FreeBSD and several Linux distributions ship  ISC dhclient with patches to enable  Classless Static Routes.