Thanks for reaching out.
Both of the controls are available already in the suite and are with great
quality and extensive feature list, so you can use them freely in your projects as long as they serve the need that you have.
In regards to the development, we have been actively developing and maintaining the project since the open sourcing - couple features were added as well as a lot of enhancements. At the same time, we are welcoming and encouraging contributions from the community as well.
I hope this answers your question. Let me know if I can help with anything else.
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal
and vote to affect the priority of the items