Update README.md

README.md

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 If you are new to Glimmer, you have learned enough to start running some [samples](#samples). Go ahead and run all Glimmer [samples](#samples), and come back to read the rest in any order you like since this material is more organized like a reference.
 
+If you are advanced and need more widgets, check out the [Nebula Project](https://www.eclipse.org/nebula/) for an extensive list of high quality custom widgets:
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+https://www.eclipse.org/nebula/
+
 #### Display
 
 SWT Display is a singleton in Glimmer. It is used in SWT to represent your display device, allowing you to manage GUI globally 
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 https://www.eclipse.org/articles/Article-Writing%20Your%20Own%20Widget/Writing%20Your%20Own%20Widget.htm
 
+Here is the Nebula Project (custom widget library) homepage:
+
+https://www.eclipse.org/nebula/
+
 ## Samples
 
 Check the [samples](samples) directory in [glimmer-dsl-swt](https://github.com/AndyObtiva/glimmer-dsl-swt) for examples on how to write Glimmer applications. To run a sample, make sure to install the `glimmer` gem first and then use the `glimmer` command to run it (alternatively, you may clone the repo, follow [CONTRIBUTING.md](CONTRIBUTING.md) instructions, and run samples locally with development glimmer command: `bin/glimmer`).