Eagle PCB Layout is around for many years and with their freeware 80x100mm licensee attracted lot of Open Source Enthusiasts to use it.
If you check the OSHW projects which people release probably 80% of them are made with Eagle for the same reason. When Eagle was available for free, nothing comparable existed, the open source tools were very immature and not so easy to use, then once you start using one CAD you get used to it and you make your own libraries, scripts, ULPs and you are tight bind to it so you do not want to move to other platform.
CarSoft (Eagle creators) had this wise idea that you can download and use the freeware version to view big projects and to edit and modify small projects with size 100×80 and up to two layers which in most of the cases is enough for the mass Arduino…
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