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What is an affordable 2D drafting software for amateurs?

I need time-and-another organize places quickly for projects and I find that some software would be useful to do that automatically. Suppose I have 100 square meters' square and 10 innovators working on the same electronics/hardware/software building project. The area is empty -- and you have budget for tables etc. You want to keep design simple. Is there some software to do that automatically or to help to do that automatically?

I rejected some very high cost package so no such things please. Any open-sourced design thing under the sun?