Top 3 C++ gravity Projects

Principia

38 729 9.9 C++

𝑛-Body and Extended Body Gravitation for Kerbal Space Program

Project mention: A rudimentary simulation of the three-body problem | news.ycombinator.com | 2024-04-02

Principia is extremely impressive, they document all their math here: https://github.com/mockingbirdnest/Principia/tree/master/doc...
One interesting detail is that the source code makes extensive use of non-ASCII identifiers, for mathematical symbols and for the names of mathematicians. One of the two primary contributors is also an active contributor to Unicode

AutoGeodesics

3 8 10.0 C++

Easily integrate the geodesics equation using automatic differentiation.
InfluxDB

www.influxdata.com sponsored

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.
N-body

1 7 7.5 C++

N-body simulation made with C++ and OpenGL (by MarcVivas)

Project mention: Realtime N-body simulation | /r/opengl | 2023-07-06

Here's the code if you are curious or you want to try it: N-body

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).