The Insightly PHP SDK by Insightly allows API communication to access contacts, events, organizations, opportunities, and projects. Test available at https://github.com/Insightly/insightly-php/blob/master/test.php
Today, Kloudless launched its Universal CRM API. The API allows developers to integrate CRM platforms into third party apps without having to custom code each individual CRM provider. The initial integrations include Salesforce, Microsoft, and Oracle. 6 CRM integrations are on the roadmap.