Tell us more about what you're thinking of building/drawing. I like FreeCAD, but it's also quite complicated, depending on what your goals are.
you mean like the various CAD software that exists?
what tool to use can depend on what you are drawing.
SketchUp works online.
LibreCAD works but I think it's 2D only.
LibreCAD is 2D only but great for making quick drawings.
openscad and onshape are some options. openscad is like coding and onshape is closer to typical 3D modeling interfaces.
FreeCAD. It'll do everything, but you have to put some time into understanding it. Fortunately, there's are plenty of YouTube videos when you do get stuck.
Krita is my favorite drawing tool, don't know if that helps, but I like it
FreeCAD is good, but maybe more complicated than you're looking for.
You might want to try draw.io / diagrams.net . It can be used in the browser or as a standalone application
Second draw.io - I've done lots of diagrams with VSCode and the draw.io plugin
You may be surprised. Blender + plugin.
If you have an iPad and a little money to spend, Shapr3D is an excellent CAD app
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