Recently I tried to develop a level editor for my small homemade game engine. As you know stuff like this is very time consuming and in most cases the result compared to the commercial soft wares is poor. After hours of work, using different developing packages, I came to an Idea and that is about developing a general purpose editor. I know this can't be a new one, but if you Google it, you won't get anything considerable. I tried and made a basic version of an editor that allows end users make their own editor by combining tools that my general purpose editor provides. It comes with mechanisms for UI customization, defining custom options, implementing commands, developing plugins and etc.

My editor is too poor to share it with others, but I want to know what you think about the whole Idea. Thank you for your attention.

I posted this topic twice, sorry for that.

Sony recently released their framework of tools on github, you may want to take a look. It could give you an idea of how to set up yours.

So basically a set of building blocks for creating editors?

What kind of editors? Text/code? XML? Databases? 2D tile-based levels? 3D levels? Terrain?

All of them! of course it requires programming tools and my editor allow users add thier own "Editing Code" by making a plugin.

Yes it would be impossible if I wanted to do all that, myself alone, but I want an app that provides the basic parts of an editor and allow users add their own code. Actually I did that!

After hours of work, using different developing packages, I came to an Idea and that is about developing a general purpose editor.

I don't know. There are a number of material and stylistic decisions to make when designing an editor of the type you discuss - every developer will have his or her own preferences, and it's unlikely that a single package, or even several packages, could satisfy everyone's diverse requirements.