The e-SignLive Java SDK by Silanis allows API communication to integrate electronic signature features into business applications. With the SDK, developers can sign documents via web service. Includes documentation, JavaDoc, and GitHub examples.
Podio is a web service that aims to provide a customizable online workplace. There are a lot of apps, and you can set up and position your dashboard as you please. However, sometimes the app you want isn't in the set. In that case, they also offer the Podio API to code your own custom apps for use within your Podio workspace.
HelloSign has announced several feature updates to the HelloSign API aimed to improve the experience of developers, requesters, and signers. HelloSign API updates include unlimited templates for testing, API request limit per hour has been increased, custom redirect capability, and more.