You can right click on any node toolbar in the bottom left of the screen to create your own custom nodes. The nodes you add to most of the tool bars will save in your global nodes folder (which is stored on your hard disk at C:\Users\<UserName>\Documents\Embrio\NodeDefinitions.

The tab with the Embrio icon is a little different, nodes you save there will be saved as part of your project and won't be available to your other projects.

The Library tab is maintained on the website server. If you have something you'd like me to add there to share with others please e-mail it to me.

At some point I'd like to make a "local library" so you can keep all of your custom nodes in your own library with a treeview like the shared library. That's on my list, but for now using the other tabs is the best way to do it.