Geogram

Geogram is an off-grid-first messenger and app launcher. It speaks several networks at once — the internet, a Reticulum overlay, the APRS network, and direct Bluetooth LE — and glues them together so a message or a file reaches the other side over whatever path is available. When there's no internet, it falls back to radio and Bluetooth; when there is, it uses it. No accounts, no central server.

Multi-transport messaging — one message goes out over internet (APRS-IS), Bluetooth LE, or Reticulum/LXMF, and incoming messages are tagged with the path they arrived on (NET, BLE, RET/RNS, RLY). Off-grid by design — APRS over radio and connectionless BLE broadcast keep working with no internet at all. A phone with internet automatically bridges its BLE-only peers onto the Reticulum hubs, so an offline device stays reachable worldwide. Decentralized identity — every station has a Nostr keypair (secp256k1) and periodically announces its public key, enabling signed and end-to-end-encrypted 1:1 messages without any directory server. Content-addressed files — media and files are referenced by sha256 hash, found through a Kademlia DHT over Reticulum, and re-seeded by every downloader. Wapp platform — install/run sandboxed WebAssembly apps (Chat, Reticulum, Circles, Player, Terminal, …) that share one native UI and the host's transports. Cross-platform — Linux, Windows, macOS, Android. In-app Update Center (stable / beta channels) for OTA updates.