The netdev mailing list is used for network development (not user questions).

KVM development mailing list.

Linux SCSI development mailing list.

The OpenFabrics Alliance is currently developing a unified, open-source software stack for the two major RDMA fabric technologies -- InfiniBand and iWARP (also known as RDMA over Ethernet). OpenFabrics hosts the git repositories for the Linux InfiniBand subsystem.

Linux RAID development.

A mailing list for Linux networking user questions.

Ongoing development of the Reiser filesystems.

The Linux Driver Project is focused on creating and maintaining OpenSource Linux kernel drivers for all types of devices. The developer mailing list is where the new projects are announced and asked for volunteers from, discussions about the project either technical or procedural, and is the general location for anyone wishing to help out with the Linux Driver Project.

Sparse, the semantic parser, provides a compiler frontend capable of parsing most of ANSI C as well as many GCC extensions, and a collection of sample compiler backends, including a static analyzer also called "sparse". Sparse provides a set of annotations designed to convey semantic information about types, such as what address space pointers point to, or what locks a function acquires or releases. Linus Torvalds started writing Sparse in 2003, initially targeting issues such as mixing pointers to user address space and pointers to kernel address space. As of 2006, Josh Triplett now maintains Sparse.

An informal project to get experienced developers to mentor new developers and coach them on the best ways to get their code ready for submission.

Linux newbies mailing list.

ALSA development mailing list.

UCARP allows a couple of hosts to share common virtual IP addresses in order to provide automatic failover. It is a portable userland implementation of the secure and patent-free Common Address Redundancy Protocol (CARP, OpenBSD’s alternative to the patents-bloated VRRP).

The Linux kernel mailing list (LKML) is focused on the discussion of Linux kernel development. Our archives of this mailing list start in January of 2007.

A mailing list for the development of Linux USB support.

Discussion about the development of Linux NFS.

Linux-arm development mailing list.

Discussion of technical topics for OpenBSD developers and advanced users. This is not a "tech support" forum. OpenBSD developers will often make patches to implement new features and other important changes available for public testing through this list.

An OpenBSD mailing list for general user questions and answers. This is the most active OpenBSD mailing list.

Discussion of IPv6 and IPsec in OpenBSD.

Important OpenBSD announcements.

DragonFly BSD commit messages since December of 2004.

Discussion about the DragonFly BSD kernel. Our archives of this mailing list start in October of 2003.

Discussion about the DragonFly BSD documentation. We offer a complete archive of this mailing list since its creation in August of 2003.

Discussion about the future development of the Haiku operating system.

Technical discussion and general questions about FreeBSD's port of packet filter (pf).

Discussion about FreeBSD clustering.

FreeBSD bug reports.

Technical discussions relating to FreeBSD.

Discussion about FreeBSD security issues. Members-only mailing list.

Discussion about dedicated and embedded FreeBSD systems.

Discussions about FreeBSD threading.

Discussion about FreeBSD performance and tuning.

NetBSD announcements.

Mailing list for OpenMoko community discussion.

OpenMoko development discussion.

Announcements regarding the Open Graphics project.