This app lets the user perform classic matrix operations, such as addition, multiplication, getting a determinant and so on, but also to rotate, transpose and other atypical operations.
This was originally part of a bigger project centered around performing multiplication of big matrices, so I spent some time working on performance, and finally made it a stand alone app. No need for a console app if you can calculate in the browser.
Link to project page: Jonamarti/MatrixCalc
Link to the app: Matrix Calculator