Earthly

Earthly is a touch-first collaborative mapping app for creating, discussing,
and sharing geographic datasets over Nostr.

Draw points, lines, and polygons; publish versioned GeoJSON datasets; annotate
maps with geographic comments; and work in MLS-encrypted Private groups.
Android Field sessions add explicit nearby-only collaboration over a shared
Wi-Fi network or hotspot, including chat, map editing, and one-time mirroring
of referenced map files for offline use.

Earthly includes its own local relay and Blossom service. Core nearby and
offline workflows do not require a separate companion relay app.