For reference, here's a few incomplete lists:

• https://en.wikipedia.org/wiki/List_of_computing_mascots
• https://www.linuxfoundation.org/blog/open-source-symbolism-exploring-the-stories-behind-linux-foundation-project-mascots-and-logos
• https://online.supertuxkart.net/addons.php?type=karts

A few that I don't see in the lists are:

• llvm dragon: https://llvm.org/Logo.html
• buildah pug: https://buildah.io/
• podman seal: https://podman.io/
• openSUSE gecko: https://en.opensuse.org/openSUSE:Artwork_brand#Logo