we have recently cleaned up parts of the developer wiki a bit and moved the list of internal projects to a more prominent location:
As you can see, we have quite a few projects and some of them would be happy about more participation from members of the Arch Linux staff as well as users.
Help in fixing and extending the software is much appreciated, but testing and opening tickets that describe flaws or usability problems are equally important!
As mentioned in the wiki, we have a central mailing list  and IRC channel  for discussing most of the projects (unless they provide other means of communication).
We hope to spark people's enthusiasm, as healthy projects ensure a flexible distribution and allow us to tackle larger goals (e.g. move to a git based workflow for packaging, effortlessly providing several architectures, automating our infrastructure and releases, etc.).
 https://lists.archlinux.org/mailman3/lists/arch-projects.lists.archlinux.org...  ircs://irc.libera.chat/archlinux-projects