I like Roll20.
It's pretty easy to learn to use and you can go as basic or as fancy as you want for free, with some nice additions for subscribers
Roll20 is excellent for a free program. It has a lot of features and options without having to pay.
Have a look at Battlegrounds (http://battlegroundsgames.com/battlegrounds-rpg-edition/). Not much tech savvy required, no messing around with XML editing, scripting, rulesets or frameworks. Yet the software is still very customizable/configurable, and can be used with any RPG system, in any genre.
This 1-minute video promo for Battlegrounds might peak your interest: https://youtu.be/OzhrATNKau8