Hi MinGWers, especially gcc users,
As c++ is becoming more popular and its easy-to-use feature, more and more people start using gcc for scientific computing. Due to many free libraries, it is possible for the c++ programs to have near-Fortran performance.
So it occurs to me that it would be very nice and useful to get a collection of such free libraries. Some libraries are already compiled for MinGW, some can be used without any compilation or modification, others need to be compiled by ourselves. 
Why not do it now? If you happen to have such c++ libraries or are interested to give contribution, just reply this post.
To name a few, Eigen2(no need to compile), Blitz++, boost(already done), tvmet, etc.