Corelib have a couple of native extensions design to help you get you work done much faster. Below is all native extensions listed.
Basic user management, permission management and acl helpers.
Set of tools abstract image editing tools, allowing a fast way of manipulating with images. At the moment ImageTools only supports GD2. other engines can be supported as well.
Search allows you to index all of your data and make it searchable using full text search.
The EAV extension allows you to use a eav model to extend your own models.