Sequel is being actively developed. New versions of Sequel are generally released monthly on the first of the month. You can join in on the discussions, ask questions, suggest features, and discuss Sequel in general by asking questions in GitHub Discussions or on our Google Group: Sequel Talk.
The easiest way to contribute is to use git, post the changes to a public repository, and send a pull request, either via GitHub or the Google Group. Posting patches to the bug tracker or the Google Group works fine as well.
You can find the contributing guideliness on GitHub.
The master source code repository is jeremyevans/sequel on GitHub.
Sequel is distributed under the MIT License. Patches are assumed to be submitted under the same license as Sequel.