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Zymplectic-Project
Symplectic integration of Hamiltonian systems. Zymplectic is a pre-compiled GUI and engine with 2D/3D-graphics bundled with more than 70 example dynamical systems in cpp format
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
While the simulation codes are available in C++ on https://github.com/Zymplectic/Zymplectic-Project (in the release package), I didn't quite manage to include the entire source of the Zymplectic executable yet for practical reasons. If you need the "draw surf" function, I can link it (but will probably only be useful if you work with OpenGL in C/C++).
NOTE:
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Hence, a higher number means a more popular project.