Apps for finding RV sites or campgrounds

Below are some of the useful apps I've used for finding RV sites and campgrounds.

• freecampsites.net Free - nice because its web based and will run anywhere. Has a list of mostly free (or very cheap) campsites. Content is user generated and some posts are very old so I don't know how accurate the data is.
• The Ultimate Public Campgrounds Project $3.99 USD This app is quite new but has over 41,000 campgrounds. The filter is great and I can filter by RV and price (free, or $1-10). I found 2 campgrounds near me that I may try.
• USFS & BLM CG $0.99 USD This app shows United States Forest Service (USFS) and Bureau of Land Management (BLM) campgrounds in the US. Great for Boondocking and finding places to park where you will be left alone.
• RVParky Free RV Parky is an RV Park directory built by a full time RV'er with the help of the RV community to help fellow RV'ers on the road. Here you can find information, images, and reviews for the most complete collection of RV Parks and campgrounds in the United States and Canada.