Just thought I would toss this out, UNO form-factor board at the top, STM32 F4 board at the bottom of the page.
http://armcontest.elektor.com/?utm_source=Elektor+International+(English)&utm_campaign=755eb2ac30-112UK3_6_2015&utm_medium=email&utm_term=0_23bd160f48-755eb2ac30-234033945&mc_cid=755eb2ac30&mc_eid=7257d9e575