Armadillo is also used in pretty well known places: NASA, Siemens, Intel, Boeing, Stanford, CMU, MIT, Schlumberger, Deutsche Bank, US Navy, etc. (source: access logs for Armadillo website).
It's also the basis for the MLPACK machine learning library:
http://mlpack.org/
Additionally, there are Armadillo bindings to Python and the R language:
It's also the basis for the MLPACK machine learning library: http://mlpack.org/
Additionally, there are Armadillo bindings to Python and the R language:
http://sourceforge.net/projects/armanpy/
http://cran.r-project.org/web/packages/RcppArmadillo/