This article might be wrong as it refers to a "not yet published ICAO list" as its source, however it states that basically all biz jets and airliners (excluding the 787 and A380) have some form of WAAS/SBAS certification option available to them.
The fourth paragraph refers to the above mentioned:
Waas Delivers on Promises and Signals Further Innovation | Aviation International News
The article I think is fairly interesting and it also talks about GBAS and GLS approaches.
Interesting article indeed. And quite contrary to what boeing told us. According to the OEM of our aircraft (both boeing and airbus) their equipment isn't LPV certified and therefore does not need to have WAAS and isn't equipped to that standard. However, at least on our boeings, GBAS is standard for the last seven years and RNP AR is possible without WAAS anyway as are BARO VNAV RNP approaches. As an airline (although based in europe) we do have zero interest in WAAS, EGNOS or whatever it is called. There was absolutely no advantage in having EGNOS operational for example, doesn't do anything for us. It is different in the GA community though, but quite understandable if airlines do not want to pay for a system that doesn't have a business case for them.