These are very useful for travel.
Free wifi is common in hotels and public areas.
Google Translate is a free app available for Android and IOS (Apple) devices, with the following features:
bookmark specific translations - can create a personal phrasebook,
SMS translation,
download languages - can then use without a connection,
Word Lens - take a photo and translate.
Field Trip is an Android app which finds great places to visit near your current location.
Wikipedia free app for Android and IOS (Apple) devices, has the following features useful for travel:
shows interesting places nearby, giving direction and distance,
can bookmark pages.
On my computer I create PDFs of useful travel information and save to my Android tablet and phone. I use CutePDF software, which functions like a printer, but creates PDFs instead of printing what you send.
Tablets are great for reading books, watching movies and playing games. I prefer the 7" format which is lighter, smaller, and easier to travel with.
Small keyboards are available for mobile devices. I use a Bluetooth keyboard with my Android tablet. One switch on the keyboard and one switch on the tablet and I have a keyboard which is much better than the touchscreen.
I also use a tablet stand for desk use.