I'm another Weather Display user and highly recommend it.
Sure it's not free, but you get lifetime updates for nothing and you can request add-ons. There is a lot in the program but it has a universal setup that makes it easy to get you going, then you can find your way around.
Weather Display Live is an add-on and as such is not required for the running of Weather Display. The live version is simply for use on a web page and updates as fast as you want it too, anything from 3 seconds to daily.
Cumulus is also worth looking at. It free to download, will store you data and upload it to a web site. It also includes the pages and file to allow an easy website set up. I'd need to check whether Cumulus will work with Weatherlink IP though, as I'm not 100% sure.