The Micropsi2 toolkit contains a complete editor and runtime environment for Node Nets, node net monitoring tools, and an editor/runtime for a simulated environment.
The toolkit is implemented in Python3, with a web GUI. The code is open source, in active development, and on github:
https://github.com/joschabach/micropsi2
Releases can be downloaded from:
https://github.com/joschabach/micropsi2/releases
You can find us in #micropsi on freenode; we’re @micropsi on twitter.