There are several ways to keep tabs on the Gren community.
Zulip is the official meeting place for people who are curious about Gren. The core team posts weekly development updates here, and there are also channels for beginners to ask questions, and for random discussion.
Our official mastodon account might be worth following if you want to be notified of anything interesting every once in a while. Alternatively, you can also follow us on twitter.
If you want to keep up-to-date on the actual development of Gren, you can find the source code and issue-tracker at Github.