IPv6 CARE, "IPv6 Compliant Automatic Runtime Environment", provides an environment where applications instantly become IPv6-compliant ('patch' mode, see RFC6535). It can also generate a diagnosis about the IPv6 compliance of an application ('check' mode). It uses an LD_PRELOAD-based library injection technique.
mrd6 is a modular IPv6 multicast routing daemon. It implements MLDv1 and MLDv2 with forwarding capabilities, MLD proxying, PIM-SM (ASM and SSM), Bootstrap (BSR) Mechanism support, static RP configuration, Embedded-RP support, and partial MBGP support. It uses IPv6 Multicast SAFI prefixes announced by peers to update the local MRIB, is able to announce local prefixes, and features filter support, support for native and virtual (tunnel) interfaces, and a CLI for remote configuration and management via telnet or locally.
xllmnrd is an IPv6 LLMNR responder daemon (primarily for GNU/Linux operating systems). It allows Microsoft Windows clients to get the IPv6 address of a server on the same local network without any DNS configuration and effectively complements IPv4-only NetBIOS name resolution provided by Samba.