Highscores
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Wurm Online Skillcompare (WOS)
Wurm Stats (WStats) - Discussion thread can be found here
Planning Tools
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WPlanner (By Budda) (Forum thread can be found here) - Updated, versatile and user-friendly mapper program for deeds, villages and mines.
Deed Price Calculator (By Grizzlyadams) - A simple calculator for previewing the installation and upkeep costs for deeds, perimeter and guards. Customisable sizes. (warning this link may be bugged and may crash your browser)
Mapper (By Discon)
Prospector (Used for finding the location of ores)
Housecalc (Used to calculate the required carpentry skill for wall plans and resources for houses)
Google Sketchup (Very popular and useful planner, and easy to learn. Helps aid builders visually with it's 3D detail. You can download tiles and house models Here, which all credit is due to Tich.)
Calculators
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Official deed price calculator
Base Price and Favor Calculator