Flip&Click SAM3X is Arduino's close cousin. It shares a lot of Arduino DNA - the 32-bit MCU, the pinout, the compatibility with Arduino IDE – but when you flip it over, you get four mikroBUS™ sockets for click boards.
Flip&Click PIC32MZ is a two-sided development board with a split personality. It can be used with chipKIT core (Arduino-style development environment), but it can also be used with mikroC, mikroBasic, and mikroPascal for PIC32. It’s a beginner-friendly rapid prototyping tool expandable with up to four click boards.