Is there any URL that lists what's new in v3.4.0 and v3.4.1?
The DDD website ( https://www.gnu.org/software/ddd/ ) points to the source tar.gz and the full manual, but nothing that says "What's New" in recent versions.
Might not be as direct as you'd like, but all well managed¹ GNU projects ship a NEWS file in their tarball. In this case you can also read it from savannah² without fetching the tarball.
The DDD website ( https://www.gnu.org/software/ddd/ ) points to the source tar.gz and the full manual, but nothing that says "What's New" in recent versions.