Actibles are an open source hardware/software platform for creating active tangibles. Actibles contain a smartwatch core, which eases both hardware and software development, and enables application developers to leverage various web technologies. The smartwatch core is augmented by custom hardware that enables an expanded set of tangible interactions, including shaking, tilting, stacking and neighboring, as well as on-screen gestures and integrated LED feedback. Actibles can be used both independently or in conjunction with other devices, such as interactive tabletops. We describe the Actibles technical specifications and demonstrate several example applications.