Vely is Free Open Source software, see license. It is available on Linux for amd64 (x86_64) or aarch64 architecture, and you can also build from source. For archived release source code, go to release history and see release notes.
Choose your distribution below. If your distro is not on the list, choose a similar one; for instance, for Rocky choose Redhat; for Deepin or Mint, choose Ubuntu; for Manjaro choose Arch; and so forth. For Raspberry PI (64 bit), use aarch64 bit packages, or for 32 bit you can compile from source.