NppX3DV
Open source set for Notepad++ for building worlds in X3D and VRML
Open source set for Notepad++ to code in X3D (classic encoding, x3dv) and VRML, the open standards for interactive and immersive 3D on Internet.
Includes: set of language files, auto-completion files, tutorials and instructions and other materials.
Download Notepad++ here: https://notepad-plus-plus.org/