In experimental, incomplete fashion, but it’s sufficient for you, as a developer, to start working with OpenTafl in engine mode. You can find the new version at the OpenTafl site. The engine protocol document has been updated with the latest developments. Although I won’t be able to say for sure until I’ve finished the implementation, this version of the protocol is nearly feature-complete, and likely won’t change very much going forward.
Expect a post in the not-too-distant future on OpenTafl’s time usage planning and time-filling activities, both of which are topics of some interest.