there are a few that have web-based graphical user interfaces (GUIs) available:

• FEniCS: The Jupyter notebook interface is often used as a web GUI for working with FEniCS, which allows for interactive coding and visualization of results.
• Elmer: Elmer GUI is a web-based pre- and post-processor for Elmer. It is a separate project but it is closely related to Elmer, it provides a web-based interface for creating and editing input files, visualizing results, and post-processing data.
• OpenSees: OpenSees Navigator is a web-based graphical user interface for the OpenSees simulation environment. It provides an easy-to-use interface for building models, running simulations, and visualizing results.
• Code_Aster: Code_Aster provides an Web application named Salome-Meca, which provides a web-based interface for working with the Code_Aster simulation environment, it can be used to create and edit models, run simulations, and visualize results.

Overall, while some of the open-source tools above can be used with web-based GUIs, it is not all of them have this capability, most of them require some programming knowledge to use, and they are mostly command line interface based. However, you can use Jupyter notebook, and Salome-Meca to interact with them on the web.