Listed below are some free programs for monitoring and configuring routers:

• Routerstats and Routerstats-Lite - programs to monitor router noise margins, connection speeds, etc.
• DMT Tool - Router Interface which reveals information from your router and allows some configuration changes via a GUI.
• DSLstats programs for Linux and Windows to monitor DSL connections using Broadcom-based routers.

This page links to wiki pages for this software.