=phpredis= This extension provides an API for communicating with [http://code.google.com/p/redis/ Redis database], a persistent key-value database with built-in net interface written in ANSI-C for Posix systems. Have a look at the [http://code.google.com/p/phpredis/wiki/referencemethods availab...

The Twitter PHP extension enables communication directly from php without implementing your own library or using one written in php. It has a simple API that internally will be based on JSON which is a dependency to this extension. *Please note that due to a limitation in Google Code the project ...

PdoXml is an fast and easy to use PHP extension writen in C for export results from PHP PDO queries to XML. You can create XML document from database, export MySQL, PostgreSQL or other PHP supported databases to XML. Support both Windows and Linux.

The webmail project run at the apache2, support receiving mails and sending mails, you just need one standard POP/SMTP mail server. This project consist of php extension coded by standard C and php pages that support receiving/sending classes.