Yes there are options. Probably the best at the moment is Weewx with a DD-WRT router to redirect. I used Pat O'Brien's method (just option 2, the router part. Stop at the end of the router firewall description. You don't need more than that).
I have an Ambient Weather WS900-IP. it works with Weewx, as will yours, but you need to redirect the WU upload to Weewx via the extra router. You can use an inexpensive router. Just needs to be compatible with DD-WRT. I use the TP-Link models for low demand DD-WRT functions like this.
If you like the Ambient Weather dashboard, this method cuts that off. So you can either buy another observier IP and have one going to Weewx via the router and the other going to Ambient Weather, or you can just forego their dashboard and add a different one. Pat O'Brien recently published a version of his custom dashboard which I really like, but have not had time to dig into that setup. Lots of info to sift through there, but a lot of interest and activity in it, so lots of help there too. Pat is a really nice guy. Very helpful.
And there was a driver that @thomas.c.howard 's son started to write, which I would really like to see grow, but he's not letting his son do side projects until his studies are under control. 
I wasn't able to get that one to work. So I'm hopeful that will be a good solution for me. I really like the Ambient Dashboard and this would be easier than getting Pat's dashboard going, yet still give me a route into HE.
But, I'm ready for the day WU shuts out owners that have freely shared information with them for so many years. For now, that's what I'm using, but when it shuts down, so too will my upload to their site and I will pipe it through the router to Weewx unless something that suits me more comes along before then.