Industry giant. It's been around a while, and has lots of supported RPGs.
2D, top down, browser-based. Free, with premium paid features.
Has licensed official WotC adventure modules.
Integrate D&D Beyond with Roll20 and Discord using Beyond20.
"The Roll20 killer you should be using" - Cyanomys
2D, top down, browser-based. Free, with paid premium features.
Recently partnered with DriveThruRPG to allow users to import all of their purchased content.
Smooth, intuitive interface. Lots of useful features.
Heavy community involvement, with frequent updates.