Ecosystems:
Python
mst.py (Minimum Spanning Tree)
This script has been given in one of the Stack-Overflow answers regarding Admund's Algorithm for finding Minimum Spanning Tree (MST) on a Directed Graph.
gen_st.py (general Spanning Tree)
I have tweaked the above mst.py to work as both minimum / maximum spanning tree(s) - depending on the argument given to the function, along with a few code refinements.