Layout of an existing house using measurements and math (and Metapost).
This is the result of my frustration with existing tools for laying out the floorplan of a house. The professional options are prohibitively expensive and overwhelming to learn just to make a single layout for my current house. The consumer tools are all lame. My biggest gripe is that when you update a measurement it doesn't reflect the rest of the house. So, I decided to write some (very) simple Metapost code to lay the house out using math.