Andrafting
CAD application for Technical Drawing exercises in Android
...This application is inspired by the 'Classical Construction', also known as 'Ruler-and-compass Construction' or 'Compass-and-straightedge construction'. However, another drawing tools can be used.
(More info about classical construction: https://en.wikipedia.org/w/index.php?title=Compass-and-straightedge_construction).
TABLET & MOUSE recommended
Desktop version (not compatible)
https://sourceforge.net/projects/jdrafting/