Synthclipse
GLSL shader prototyping tool based on Eclipse IDE.
...The JSX API is consistent with WebGL but in fact exposes complete OpenGL 4+ API.
To install Synthclipse one can download prepacked Eclipse with Synthclipse feature (see "Files" section above) or update an existing Eclipse using the following Update Site: https://kamil-kolaczynski.github.io/synthclipse/update/
Prepacked version has one advantage: it has nice console logs coloring since it shipped with Grep Console plugin ( https://marketplace.eclipse.org/content/grep-console ) that is configured specially for Synthclipse logs.