This upgrade is highly recommended and completely transparent. It will not have any compatability issues with 3.1.6 unless for some reason your script relied on the system to not parse blank tags. This should be handled on the script end and not within the framework.
Rapyd is a set of components/classes that can help you to develop web applications "rapidly".
Now It's a "library" for Code Igniter (elegant, powerfoul and tiny PHP Framework).
CVPFrameWork is a set of classes for PHP5 developers. It's not specifically web oriented but it's focused on a lower lever. For example, make the script creation easier, database access, working with Sockets, mail sending, error control... and of course, it also helps with web logic development. Nowadays it's at development status. We are using it in our projects, but we recommend not to use it for critical applications
Joining mailing list will entitle you
to receive occasional emails informing you of news and
updates to the site and any special offers that may be
of interest to you.