Fantasy Grounds is a great tool for role playing online.

When I first tried it, I have to admit, I was a bit overwhelmed. It has a lot of bells and whistles, a lot of things you can do with it, a lot of automation you can use. It was a bit of a learning curve, but once I got used to it and played around with it, I was impressed with what you could do with it.
Note: I found Digital Dungeon Master on YouTube to be extremely helpful when learning how to use it. He has a lot of tutorials available on his channel: https://www.youtube.com/channel/UCzRjU07iEZga5dxZOEpE1dQ

While it may be considered a bit on the pricy side, it's price is very comperable to the cost of the books you would normally be buying to play the games, it gets updated quite often, and if you simply don't want to pay for it - download the trial, and play with a game master that has an Ultimate License. That gives you a fully functioning client and you play for free. The amount of built in tools and automation for games like D&D 5e is amazing as well. You can use as much or as little as you like.

The conversions I have purchased have been very well done and worth the money I paid for it. Having everything ready for me in the program, but fully modifiable is very much worth it.

If you decide to give it a try, do yourself a favor and go to the forums and get involved. There are a lot of great people that play, there are events like FG Con, and lots going on that you can be a part of.

As someone that doesn't have the ability to sit down around a gaming table with a group irl much anymore, this has allowed me to enjoy one of my favorite pasttimes again. If you are a tabletop rpg enthusiast, I highly recommend it.