Nothing professional; just sketches for personal projects in and around the house. Usually fairly detailed, but mostly useful to get a sense of proportion and to design the basic layout of things like built-in closets.

Inkscape's snapping, aligning, and layering features make it a good tool for this as long as you need nothing more than 2D views.

I also use Inkscape to prepare the (plywood, MDF) sheet sawing instructions for the lumber yard. They love it when customers present them with a clear overview for the cuts (and I love it when wood I order is cut correctly). For me it's useful to use a single sheet as economically as possible.

That's awesome, thank you. Built-in closets and simple shelves is what I'm looking for. And maybe a french cleat system for organizing tools. A 2D view should be enough.

I'm using draw.io for floor plans to get a basic sense of spacing for bigger projects. Inkscape looks like a good fit for smaller ones.