lns.http is a simple framework for writing Common LISP Web applications. It handles the incoming connections, parses HTTP headers and queries, and finally hands control over to your URL handler. It is an HTTP/1.1 compatible Web server, but tries to achieve compatibility with lesser (down to the informal HTTP/0.9) clients.
XLB is an HTTP load balancer. It features connection management where requests are parsed and assigned to a persistent connection to the back-end server. This reduces back-end server load by causing fewer forks, less memory use, and lower CPU consumption. It can decode SSL requests, which is useful if you have an SSL accelerator board. Scripting allows requests to be routed to specific pools or headers modified based on the URL, filename, source IP, and other fields. A fast in-memory cache is included .
The Darwin Calendar Server is a standards-compliant server that allows multiple users to collaboratively share calendaring information. It provides a shared location on the network to store schedules, and allows users to send each other and manage invitations. In order to provide interoperability with multiple calendaring clients, the server implements the CalDAV protocol, which is an extension of WebDAV, which is in turn an extension of HTTP.
Kahua is a continuation passing style (CPS) application framework and server. It is written using the Gauche implementation of Scheme. It has the advantage that you can use "continuations" easily, so you can solve the typical Web application's problem of process disconnection. It allows you to program declaratively by using S-expressions as a fundamental data type, you can use Kahua's Object Database to persist data, and you can modify the function being run, supporting incremental development.
MiniWebsvr is a small Web server that aims to one day be embeddable. It supports static Web pages, directory listing, HTTP MIME encodings, GET/HEAD/OPTIONS, and logging to disk. It has a small memory footprint, is multi-threaded, and supports command line options, conditional GET:, If-Modified-Since:, and range-bound downloads (download resuming).
Remo is a graphical rule editor for ModSecurity, an Apache security module. ModSecurity is quite difficult to configure successfully. Modsecurity.org advertises a tested core ruleset granting you protection from most known attacks, but this is only blocks traffic known to be dangerous, when it is more effective to block everything not known to be safe. Remo is meant to assist in the difficult task of writing the rules that would correctly describe the requests that are valid for an application.
OrionSMG is a secure message gateway for transporting ebXML, SOAP, and custom message formats. It complies with the OASIS ebXML 2.0 specification, and can act in both intermediary and processing MHS roles to provide end-to-end reliable messaging. The program runs natively on Linux, OS X, and Windows with ODBC/PostgreSQL database support.