Subsurface is an open source dive log program with a relatively small but active set of core contributors. It was created as a Gtk application and did reasonably well with a number of successful releases. Early 2013 the developers decided to change course and switch to Qt. This presentation will discuss why we did this (interestingly enough, a good bit of discussion after my presentation at LCA2013 was part of the motivation to migrate), what obstacles we encountered and what advise we have for other applications frustrated with Gtk (or curious about what a migration to Qt might have to offer). Dirk Hohndel. Dirk is Intel's Chief Linux and Open Source Technologist. He has been an active developer and contributor in the Linux space since its earliest days, among other roles, he worked as Chief Technology Officer of SuSE and as Unix Architect at Deutsche Bank. Dirk joined Intel in 2001 and since then has been working in the Software and Services Group with a focus on the technology direction of Intel's Open Source Technology Center and Intel's engagements in open source. His interests range from kernel to user interaction, from massively scalable cloud services to mobile operating systems. He is an active contributor in many open source projects and organizations, various program committees and advisory boards and currently maintains the Subsurface dive log project. Dirk holds a Diploma in Mathematics and Computer Science from the University of Würzburg, Germany. He lives in Portland, OR, USA.