Thanks bigpup for discovering it, https://www.forum.puppylinux.com/viewto ... 31#p118131 and Clarity for providing the link to a Youtube tutorial on how to deploy and configure it, https://youtu.be/2ITezMkbAqE.
The Youtube shows that versions can be installed into Windows, Linux, Mac, Android and IOS. Downloads are from here, https://localsend.org/download. There are deb, AppImage and tar packages for Linux. There's also a link to 'All Releases', i.e. older versions.
LocalSend evidently runs under Bookworm on whose thread bigpup reported it. I started today booting into Bionicpup64. The Appimage failed silently. The tar package is a portable. LDDing its binary revealed a missing dependency. Perhaps an older release might function, or the dependency can be satisfied.
Current AppImage ran OOTB under Jammypup64. ListDD under both Bionicpup64 and Fossapup64_9.5 of the portable and installed deb revealed this missing dependency: libayatana-appindicator3.so.1 which is not available via pkgs.org for 'Ubuntus' or debians. But it must be a 'builtin' of Jammy and Bookworm. Flinch? Or try an earlier version.
Please report your experience and any discovered 'workarounds' for various Puppys.