Is Nxt open source?

[lurker10]

FYI, newcomers!
Did you know you can mine NXT (and buy Ardor with it on the Nxt Asset Exchange!) in the Lucky node project?
Computational and bandwidth requirements are very low - some users run it on a Raspberry Pi.
Run the node 24/7 or as often as you can while you work or play.
Join in with the over 100 nodes that are already in the project.