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System Stability Tester is a multi platform open source clone of SuperPI and comes with a GUI and a CLI. It can be used for CPU and RAM burning, stressing and benchmarking.
QwtPlot3D is a graphics extension to the Qt GUI application framework. It provides a 3D plotting widget for scientific data and mathematical expressions. It compares to the existing Qwt Project.
...It could be useful for resolving equations (it'll come soon) and right now. It does solve numerical ones (no literals) right now. Gauss will have user interface through Qt in newer versions, but it is still a console app.