Nullstack analytics is an anonymous visitor tracker and reporting platform for websites. Works in "Software as a service" model, free members allowed to register one domain and paid memberships can track unlimited domains. Also enterprise level service options available.

CAIN is modular and portable fork of codeigniter web framework. It consists of reusable code which includes modules from database accessibility, on the fly asset compression, geolocation, oauth, seo, memory cache, session management, gravatar, browser information and more.
Basically it's a boilerplate for a standard SaaS project which includes everything you possibly need at backend.