Although we've seen a deluge of tinker-friendly boards, many of them share a dirty secret: they're borrowing someone else's OS. The creator of the new CoAction Hero board, Tyler Gilbert, doesn't think that's good enough for those who want both control and ease of use. His stackable ARM Cortex-M3 design runs its own real-time platform, CoActionOS, that supports Raspberry Pi-style features like file systems and multitasking while abstracting the hardware enough to remove some of the usual headaches. Coding for the CoAction Hero is much like writing a desktop app, and a Qt-based developer kit helps owners write their own interface without knowing the circuitry inside-out. The board is being crowdfunded and won't ship until July if all goes according to plan, but a relatively low $10,000 target and $29 minimum pledge for a device should get the Hero into the hands of intrepid project builders.