Introduction - If you have any usage issues, please Google them yourself
Houdini Expression Editor allows you to set up an external text editor for all type of expressions. Such as Vex snippet, python code, HScript. It uses a system of file watchers to keep track of code updates in real time. It doesn't freeze Houdini and you don't have to close your editor to see the updated code applied on your parameter.
Also compatible with custom Python SOP nodes source code.