Code Igniter is a Scripts software developed by EllisLab, Inc.. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Code Igniter:

Edit By BS Editor: CodeIgniter is a powerful PHP framework with a very small footprint, built for PHP coders who need a simple and elegant toolkit to create full-featured web applications. If you're a developer who LiVES in the real world of shared hosting accounts and clients with deadlines, and if you're tired of ponderously large and thoroughly undocumented frameworks.