In the meantime, the zoo of Arduino boards literally exploded. Here, only the very first standard boards are listed.
Which board should I get?
ATmega2560 and ATmega1280
UNO SMD: using A6 and A7, DIY
UNO SMD: using A6 and A7, industrial
Play With Due
Upload to Pro Mini without soldering pins
Clauduino is my personal
. Any use of this material is at your own risk.