Roll20 is the easy-to-use virtual tabletop that brings pen and paper gaming to the web the right way. Built on a powerful platform of tools, yet elegantly simple, it focuses on enhancing what makes tabletop gaming great: storytelling and camaraderie. It's incredibly user friendly, and runs right in your web browser, so there's nothing to download or configure.
Ranked in these QuestionsQuestion Ranking
Pros
Pro There's nothing to download or install
Roll20 is a web-based application that can be run in any modern web-browser making for an easy and quick way to get all players up and running.
Pro Easy access to character sheets inside of RPGs
You can view your character sheets, and make rolls by clicking on various skills and abilities on the character sheet. You can cast spells by clicking on the appropriate parts of character sheets.
Pro Has a whole backlog of premade RPGs
Pro Free
It's free as long as you don't need too many features, otherwise you have to subscribe.
Pro Easy to control what players can see
With any subscription ($5/month) on the part of the GM, Dynamic Lighting can be enabled. This allows players to only be able to see what their characters should see, without any management by the GM. Light boundaries must be set up beforehand, or you can buy professional maps.
You can use fog of war for free, which has simple controls.
Pro Very easy to create 5e character sheets
Charactermancer uses SRD content, and any purchased modules to turn character creation into a multiple choice wizard. No need to type in the text of spells or abilities, the weights of objects, or calculate your armor class. This is all performed automatically.
Pro You can make whatever RPG you want
Pro Very easy prep for D&D 5e
Wizards has created purchasable modules for nearly every published fifth edition adventure. These are set up and ready to go, if you know how to use Roll20. There are additional 3rd party submissions available for purchase or for free on the marketplace.
Cons
Con Laggy
The Roll20 interface is a little bit more sluggish than it ought to be.
Con Not 3D
Roll20 is a strictly 2D, top-down view tool.