These guys: https://en.wikipedia.org/wiki/Access_(company)
Still alive, to quote GladOS. It provides the Kindle web browser, for instance.
Second, BeOS has been reborn as Haiku, which is also very much alive, and includes what Be code it legally can (the Tracker, mainly).
Haiku is IMHO the most complete/most interesting desktop FOSS out there. Haiku is now self-hosting and recently entered beta, after a long gestation. There's very little manpower behind it, so progress is slow, but it is moving.
So, significant influence, I think it's fair to say. BeOS shipped, it sold, I reviewed v5 and it remains my favourite x86 OS ever written. (Yeah, I'm biased. Sue me.)