Re: [Trisquel-users] Is Arduino Free software friendly?

[andrew]

It occurs to me you might be interested in alternative hardware platforms.   
In which case I suggest you start with the FSF Single Board computers  
page[1].  However, while they often have GPIO etc pins and some extension  
boards (caveat emptor) making a fully free embedded GNU/Linux system out of  
one of these is not a job for beginners.

https://www.fsf.org/resources/hw/single-board-computers