There is a new version 0.99.2 of JHexen, the OpenGL and Direct3D port by Jaakko Keränen, available at the JHexen site. This release brings a lot of improvements to the sound code, a selectable crosshair, as well as "slightly faster texture loading" and other fixes, and the source code is available too. Jaakko also inquires after help with creating a Glide renderer.