I know there was at least one conversation recently around Chess programs. Someone wrote to me today about one which seems to be accessible: https://lichess.org/
They wrote because they were having an issue with it in Firefox, however they advised it works well in Chrome. From a quick look, it seems you can play against another player, or against the computer.
And that's all I know about it, but for anyone interested, do feel free to check it out and let us know how you find it (maybe continue the conversation in the chat group?)