Titanium core
What many consider as the main component of Titanium, comprises three major components discussed in the following sections.
Titanium Mobile SDK
Any developer who wants to develop mobile applications using Titanium must use the SDK. It comprises more than 5000 APIs.
The SDK is developed by a company named Appcelerator, but it is an open source project and is released under the Apache License. This means that you can look at the source code and even modify it if you wish.
Titanium studio
Studio is an Integrated Development Environment (IDE) based on Aptana Studio (which itself is based on the Eclipse platform). It offers all of the basic features you would expect from an IDE, such as project management, code editor, and some pretty powerful features such as debugging.
While Appcelerator distributes it for free, it is not an open source product. They do, however, provide an SDK if you ever wish to expand some of its features.
Appcelerator analytics
This is an analytics module for developers who want to track the deployment of their app.
The service is free up to a certain point. This means that if you generate a lot of traffic, you will probably have to move over to a paid service plan.
Appcelerator Cloud Services
Appcelerator Cloud Services (ACS) is a cloud service that offers over 20 prebuilt common services you would expect from a cloud service provider. It becomes interesting when it is in very tight integration with the native SDK.
Simply create a new project in Titanium Studio, and boom, you have a cloud-enabled application! This saves enormous efforts in terms of integration. Like analytics, the service is free up to a certain threshold. If you go over that, you will have to move to a paid plan.
Also, ACS is not limited to Titanium applications. In fact, they offer SDK for other platforms and languages as well.