[http://webdepp.sense-net.at/~toni/wurm/housecalc.php Housecalc] (Used to calculate the required [[carpentry]] skill for [[wall plan]]s and resources for [[house]]s)
[http://sketchup.google.com/ 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 [http://sketchup.google.com/3dwarehouse/cldetails?mid=2be414a114815b9ef9d5388d05b6f880 Here], which all credit is due to Tich.)
== Calculators ==