this game is still in development?

[bitbomb]

The Matrix Online was developed and released not only just for PC, but for MS Windows exclusively. The single player Matrix games like Enter the Matrix and Path of Neo were released on both PC and consoles, though the console version (for Enter the Matrix anyway) was even buggier than the PC version.

Some super basic info: https://en.wikipedia.org/wiki/The_Matrix_Online

It should be noted that certain members of the community have had varying degrees of success running MxO on Linux with an interpreter, though it still has flaws. But I don't think other OS's on PC is what you're curious about.