Two or so years into the Hydra project, around 2010, an on-line demonstrator was produced for the emerging software. The product was called Hydrangea. It proved difficult to keep up to date at a time of rapid development and was soon dropped - but it was in use long enough to get its own logo.
For Hydra Connect 2016, the local organizers took the project's basic logo and extended it. It was used on large display screens adjacent to the conference's main auditorium.