Sega makes some interesting accessories, even if they aren't putting out too many games nowadays.
Their newest arcade board, the Sega Nu was released back in 2013 (an windows 8 system with 3rd gen i3), but has only had two games released for it, Hastune Mike Future Tone, and some MOBA thing called Wonderland Wars. Their older board, the Ringedge 2, is currently getting a lot more third party support in Japanese arcades.