After some time without a release, I just released mavlink-router 2.
Mavlink-router allows you to route mavlink packets between different “endpoints”, like flight controller, companion computers, GCS, etc. It is used in APSync, Emlid’s RPI images and in other companion computer setups.
With version 2 we had some great improvements regarding handling flight stack log files and more minor improvements like reducing UART latency, sync()'ing the file system periodically, allowing components to filter messages they are not interested in to reduce bandwidth requirements, etc.
Full release notes can be found at: https://github.com/intel/mavlink-router/releases/tag/v2