Unvanquished is based upon the open-source id Tech 3 engine with the XReaL rendering improvements to form what they call the OpenWolf engine. There's a GL3 renderer with this work and they have been working to improve it as of late.
In a recent update posted to the project's blog they mention, " In regards to the codebase, we've been working heavily on it, as always. For instance, we've made some improvements to the GL3 renderer. It now uses roughly 90 MB less memory during the loading of maps, and GLSL's cached files take less space on your hard drive. Our goal is to refine the performance of GL3 to the point that we can safely drop support for the old vanilla renderer. This way, we only have to support one renderer, and we don't have to worry about models or maps looking poorly on vanilla."
This is exciting to see an open-source game working on OpenGL 3.x support and taking it to the point that eventually they plan to drop their old id Tech 3 era renderer using GL2.
These improvements for Unvanquished and its open-source game engine will be found with their Unvanquished Alpha 8 release due out on 7 October. This next alpha release will also feature improvements to the human model, a new map, and various other enhancements that have come about since the Unvanquished Alpha 7 release that happened at the beginning of September.