Here are three free BGP tools I use on a daily basis to keep my clients networking running smoothly.
Hurricane Electric Free BGP Tools
This site has a hand full of free tools to help see the way your network is seen by others. It allows you to search based on IPv4/IPv6 blocks, ASN or by name. Very useful to see what providers have what transit and who they peer with. Also allows you to see what public exchanges that are in. Uses data from public sources and other free sources so it may not see all private peers and exchanges.
Radar by Qrator
Here is another free site very similar to Hurricane’s site. Also allows you to search based on IPv4/IPv6 blocks, ASN or by name. They will rate your ASN and let you know if there are route leaks or Bogon’s coming from your network. You can also setup a BGP feed to them to allow them to monitor your inbound routes for your peers.
University of Oregon Route Views Project
This site has a collection of tools to help you monitor your BGP network. The most useful tool is they give your access to their routeview routers “Collectors” to perform queries on their Cisco/Zebra or Quagga platforms. This is very useful to see how providers are seeing your network including AS-Path.