Excalibur is a real-time packet sniffer / analzyer for Dark Age of Camelot which runs on the Linux platform. It allows you to see an overhead view of the surrounding area including:

An overhead view of the Midgard city of Jordheim. Note the locations of every NPC and player. Tradeskill commissions have never been easier!
Another shot of Jordheim. This time with merchant names turned on.
Approching Jordheim from East Svealand. Note full color map and structures.
A shot in Hibernia in Tir na mBeo.
Zoomed out from Tir na mBeo showing adjacent zones.
A shot of what it looks like after your relic keep force meets an even bigger relic keep force. Note the class names of the enemy realm players.