ADJE WebMail is a set of Perl CGI scripts which provide a Web interface to existing email accounts on any POP3-compliant email server. The software provides a complete interface, including encoding/decoding attachments, email and URL markup in received emails, and an address book for each user.
PHP Mobile Mail is aimed at mobile professionals who want to use their favorite MUAs (noteably pine or mutt) on their laptop, either in UNIX or Windows (under GNU Gygwin). This lets you work offline. It includes a mail_spooler program, which accepts the output of you MUA and spools (on, or offline). When connected, another process parses through the spool and sends your messages. It is also designed to "fake" using your REAL email address with free services like gmx.net, or mail.yahoo.com, when using their POP and SMTP servers, assuming you have a domain and account that you can control to this degree.
Sawmill is a log analysis tool which can be used to analyze Web site traffic, proxy usage, ftp usage, and much more. Major features include a persistent database for long-term tracking of statistics, hierarchical data mining features, and many security features appropriate for use in a multi-user environment.
X-Cart is a PHP shopping cart software used by tens thousands on-line merchants worldwide. It provides a wide range of e-commerce features, flexible "tableless" design, easy text content modification using WYSIWYG tools, W3C XHTML 1.0 compliance, SEO friendly product catalog, Web-based administration, on-line payment gateways support, real-time shipping cost estimation based on product dimensions, inventory management, full multi-language support, and report management. X-Cart has no logical limitations on the number of products and categories in product catalog.
Cyclone is a low-level network toolkit that provides support for HTTP 1.1 in an API very similar to the one implemented by the Tornado Web server. It has localization based on gettext with pluralization support, native support for XMLRPC and JSONRPC, native support for WebSockets (drafts 75 and 76), decent support for sending plain text or HTML email with TLS and attachments, built-in support for Redis, and support for HTTP authentication.