I have just released a new version of glplotter, a small utility implemented using Castle Game Engine to draw graphs. Graphs can be defined using an intuitive mathematical expression syntax (thanks to Castle Script). Multiple graphs are visible at the same time, and you can inspect the function graphs by moving, zooming, toggling various grids and scales.
Everything is documented on glplotter webpage. The source code is on the project’s GitHub page. The released binaries are on GitHub releases.
Please support the engine development on our Patreon. It funds development of the engine, along with all the extra tools.