No joke. C source code from a employee in 2001 in Ren tech. I also found a bunch of research papers from another researcher at the firm. This is of James Simmons fame
https://github.com/silpol/mrsync
https://captainyc.github.io/research.html
Just follow these research names of RenTech via Linked In. This shows what kind of projects they worked on before joining the hedge fund.
Tyler Olsen from MIT
https://github.com/tjolsen
also;
Blaze is an open-source, high-performance C++ math library for dense and sparse arithmetic. With its state-of-the-art Smart Expression Template implementation Blaze combines the elegance and ease of use of a domain-specific language with HPC-grade performance, making it one of the most intuitive and fastest C++ math libraries available. https://bitbucket.org/blaze-lib/blaze/src
NOTE I now post my TRADING ALERTS into my personal FACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!