Hi Kathy,
None are quite the same or extensive as Weather Underground, but several do provide PWS data and some include a map, and some have webcam option. These are independent sites from the station manufacturer/seller:
Windy.com
PWS Weather
Met Office WOW
APRS/CWOP
AWEKAS
WeatherCloud
OpenWeatherMap
Windguru
Weatherlink.com Map is a great way to see Davis stations data around the world.
Enjoy,
Paul