Apps

A smartphone or a tablet with internet connection is a big plus.  Without is a much adventurous alternative.

I use a smartphone, with Android mirror to my double DIN touch screen car radio, complemented with a tablet+removable keyboard for planning and watching movies.  You can also use a tablet with SIM and a tablet holder on the dash.  

Navigation

Only some navigation app, take in account size and weight of your rig: I found CoPilot & Sygic.  Monthly fee keeps me from testing it.  Pop me a mail if you have experience with it.

So far I preffered Waze, but it does not offer sharing of points-of-interest between PC and mobile or showing POI's while driving or navigating/planning.  This is much easier with google maps with a google account.

Finding campervan parking, service points

Park4Night	PC, IOS & Android	Open, community based.	EU and beyond	All kinds of parking, service points, ...
Camping-Car Park	PC, IOS & Android	No subscription. Only their facilities.	France. Some not on Park4Night.	Mostly full option (water, electricity, gray water and toilet dupmp)
Google satelite view	PC, Smartphone browser	Free, internet needed	World	Look for white square boxes
Backcountry navigator	Android Basecamp + openstreetmaps on PC	Free Off-line on smartphone = download maps upfront !	World	Small (off-) road opportunities to stop/park/...

Untested: Campercar, CamperVanBible

Many more

Camping

ACSI IOS & Android & how to