Registered for the CAD interface of FotoG, a close-range photogrammetry package.
IANA registers 3878 as fotogcad, "FotoG CAD interface", to a private assignee. FotoG was a close-range photogrammetry product used to build measured 3D models from photographs — the registered port is its link to a CAD application, not a general-purpose network service. No protocol documentation is public and the software is not in current circulation. Expect to never see this on a scan.
Do not expose
A local application-to-application interface with no documented authentication has no reason to be reachable off the workstation.
$ sudo lsof -nP -iTCP:3878 -sTCP:LISTENSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.