The Insightly Python SDK by Insightly allows API interaction to access customer relationship management features such as create, read, update, and delete leads. Import example available at https://github.com/Insightly/insightly-python/blob/v2.2/import_example.py
The quality of your supporting documentation can steer the success or failure of your API. This documentation must include a broad spectrum of information covering many use cases to offer real value, but the trust this builds with developers is a vital factor in continued use.
Layer 7, a CA Technologies company and leading API-driven integrations security and management solutions provider, has just released the results of a survey focusing on key enterprise concerns that are driving the adoption of API management solutions.
Celoxis is both an online and installable project management platform integreted with Microsoft Outlook, iCal, Google Calendar, and Salesforce.com, among others. Celoxis explains the Celoxis API in a way that suggests they want you to be able to use it easily.