Debian is currently starting to convert some of its packages so they will understand IPv6 which will be eventually the new protocol that is used on the Internet.

Patches for different applications.

The goal of the Linux IPv6 HOWTO is to answer both basic and advanced questions about IPv6 on the Linux operating system. This HOWTO will provide the reader with enough information to install, configure, and use IPv6 applications on Linux machines.

Microsoft is developing support for Internet Protocol version 6 (IPv6), a suite of standard protocols that will become the next generation of network layer protocols for the Internet. IPv6 represents the future of networking. The new protocol is designed to solve many of the problems of the current version of IP (known as IPv4) with regard to address depletion, security, autoconfiguration, and extensibility.

Microsoft's IPv6 Technology Preview for NT

Status of the implementation of IPv6 in Linux and the cookbook for setting up IPv6 on Linux.

Project to develop IPv6 & IPsec stack for use in BSD-based operating systems. Included in the OpenBSD sources since OpenBSD 2.7 Release.

Trumpet supplies Winsock v5.0 which is a fully-featured 32-bit dialler used with Windows 95/98 and Windows NT with IPv6 capabilities.

Company resources about IPv6.