I have worked on major development of two codes over the last few years. Both are dedicated to studying the evolution of binary stars, but from different perspectives. They are complementary approaches which together give us new insight into the physics at work in binary stars.
My binary_c/nucsyn code is for population synthesis - it is fast and reliable but cannot calculate stellar structures. It is perfect for population studies and exploration of the binary-star parameter space. I developed this code first in Cambridge, then Utrecht and a little while in Brussels. It is now used by a large number of collaborators worldwide.
The other, Binstar is slow but calculates the stellar evolution in full detail. It is based on the Brussels STAREVOL code and I developed it while at ULB.