Laptop programs for RV travel. Some are free, but most will set you back a few dollars.
SKYPE - With a good Campground WiFi connection, you can "Skype" your grandkids.
OVERDRIVE - Download Audio Books from your local Library and make long driving days much shorter.
KINDLE for PC - Download books for rainy day reading.
SILVER LEAF - Diesel Engine Monitoring System Software - Connect your Laptop (USB) to the diagnostics port for continuous monitoring of all major engine parameters.