Skybrud.Umbraco.GridData is a package with a strongly typed model for the grid in Umbraco. The package makes it easy to work the grid in your MVC views, master pages or even in your custom logic - eg. to index the grid data in Examine for better searches.
Limbo.Umbraco.BlockList is a package for Umbraco that extends the default block list property editor, making it possible to control the CLR type returned by our version of the block list property editor.
Limbo.Umbraco.Rte is small package that brings extended functionality to Umbraco's build-in rich text editor (TinyMCE). The package does so by adding a new Limbo RTE property editor, which enables developers to select a number of processors, that may modify the HTML - eg. to ensure that external links always open in a new window/tab.