You can grab packman via a small script I've put on pastebin:
pastebin run 4zyreNZy
This script will automatically download packman, then have it fetch the other files it needs and finally install a small package that makes packman easier to use (as it installs in /usr/bin, this initially installed package adds /usr/bin to the shell path on startup).
Many of my ComputerCraft programs are easily installed through packman, such as LyqydOS, LyqydNet, Touchpoint, and nsh. You can also find neat things like Gopher's minesweeper game among the available packages!
If you want to get your packages listed, simply create a valid package list at a static URL (such as a pastebin paste you can edit, or a file in a github repo) and send a pull request adding your pack's URL with an appropriate name to the repolist on github.