Meshtastic is described as 'Project that enables you to use inexpensive LoRa radios as a long range off-grid communication platform in areas without existing or reliable communications infrastructure. This project is 100% community driven and open source!' and is an app in the network & admin category. There are nine alternatives to Meshtastic for a variety of platforms, including Linux, Mac, Android, Windows and BSD apps. The best Meshtastic alternative is bitchat, which is both free and Open Source. Other great apps like Meshtastic are Briar, Reticulum, Yggdrasil and cjdns.
Decentralized messaging app enabling secure peer-to-peer communication over Bluetooth mesh networks with end-to-end encryption, channel-based group chats, store & forward delivery, automatic peer discovery, no accounts or phone numbers, and privacy safeguards.
An open-source decentralized and encrypted messaging app even without internet connection via Wi-Fi and Bluetooth. Messages are stored securely on your device, not in the cloud. Connect directly with nearby contacts - no Internet access is required.
The cryptography-based networking stack for building unstoppable networks with LoRa, Packet Radio, WiFi and everything in between.
A proof-of-concept scalable IPv6 meshnet, featuring end-to-end encryption, a unique spanning tree routing algorithm and aiming to implement novel backpressure routing metrics.
A simple mesh network communications app powered by the Reticulum Network Stack.
Decentralized messaging client for Android, Linux and macOS allowing you to communicate with people or LXMF-compatible systems over Reticulum networks using LoRa, Packet Radio, WiFi, I2P, or any other medium Reticulum supports.
MeshCore is a lightweight, portable C++ library that enables multi-hop packet routing for embedded projects using LoRa and other packet radios. It is designed for developers who want to create resilient, decentralized communication networks that work without the internet.
dn42 is a big dynamic VPN, which employs Internet technologies (BGP, whois database, DNS, etc). Participants connect to each other using network tunnels (GRE, OpenVPN, Tinc, IPsec) and exchange routes thanks to the Border Gateway Protocol.
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I like Briar because it doesn't require external hardware and is more stable.