LibreMesh is described as 'set of modules extending the OpenWrt router distribution to create self-configuring wireless and wired mesh networks' and is an app in the Network & Admin category. There are more than 10 alternatives to LibreMesh for a variety of platforms, including Linux, Mac, Windows, Online / Web-based and BSD. The best alternative is DD-WRT, which is both free and Open Source. Other great apps like LibreMesh are OpenWrt (Free, Open Source), pfSense (Free, Open Source), GNUnet (Free, Open Source) and MikroTik RouterOS (Paid).
OpenWRT ( open - wireless receiver transmitter ) is a niche Linux distribution mainly installed on embedded devices, e.g. residential gateways. It is built on top of the Linux kernel and consists of a collection of diverse software packages.
GNUnet is a framework for secure peer-to-peer networking that does not use any centralized or otherwise trusted services. A first service implemented on top of the networking layer allows anonymous censorship-resistant file-sharing.
OpenWISP is a software platform that can be used to implement a complete public wifi service. The suite includes applications derived from tools used to offer public wifi service in different European countries.