Update: 21-09-16

LogBot

@logtoolbot

This bot can create links between groups in order to forward messages in one direction. To build a full bridge, simply do this twice, once per group. Add me to your groups and enjoy!

Note: The concept was originally by me, but used first by the owner of @IchLoggeBot (we met in a group). My bot is an enhanced version, but it is not forked from his code.