- SilverStripe HandyPages for a quick start.
- heyday' menu manager can help to manage multiple menus on a website.
- ZenValidator does a good job validating inputs and uploads from content-editors as well as website users.
- Inheritage by Sitetree allows you to inheritage a $db-value over the SiteTree.
- Backendmessages for message boxes in the backend.
- IDE Annotator Add PHP Docblocks to your objects and controllers.
- LittleGiant' SEO editor helps you to define your meta tags wisely.
- SilverStripe SEO suite is set of useful modules for SEO
- CWP installer
- https://github.com/Rhym/silverstripe-boilerplate-installer
- https://github.com/toastnz/quicksilver
- https://github.com/fullscreeninteractive/silverstripe-boilerplate including the ZURB Foundation module by ryanwachtl
Suggest a link via the issues :)