Hey Elliott It might be worth checking out Warewolf ESB - it's a visual programming platform with flow-based programming principles. It's primarily a service bus, but for your needs it will really help you move away from the "spaghetti code" and into a more modular, visual application. It's open source and free:

Compiled version: http://warewolf.io Source code from GitHub: https://github.com/Warewolf-ESB/Warewolf-ESB