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AOLserver AOLserver is a multithreaded, TCL-enabled, massively scalable and extensible Web server designed for large scale, dynamic Web sites such as Digital City and AOL.COM. It includes complete database integration, dynamic page scripting, and an open, extensible architecture.

APAz aPAz is An ultra-light PHP AnonymiZer. It is intended to be a "Put it anywhere, browse everywhere application". You can use it on any Web server that uses PHP and allows socket functions.

AWStats Advanced Web Statistics is a free tool that generates advanced web server access statistics graphically. This web server log analyzer works as a CGI or from command line and shows you all information your log contains, in few graphical web pages. It can analyze IIS 5.0+, Apache log files and some other web servers (log files with a personalized format are supported since version 3.0). It's the best statistics tool for web server with less than 200,000 visits a month. The program can measure visits, unique vistors, pages, domains/countries, OS busiest times, robot visits, search engine/keyword used, and HTTP errors. Statistics can be updated from a browser or your scheduler. The program also supports virtual servers.

Anti-Web httpd 'Anti-Web httpd' is a single-process Web server that relies on its inherent simplicity to be robust and secure. It supports virtual hosts, CGI, IPv6, and more. In its default mode, it is easy to launch and requires no configuration files.

Autobench Autobench is a collection of scripts to automate the benchmarking a web server (or for conducting a comparative test of two different web servers). It is a wrapper for httperf. Autobench runs httperf repeatedly against each host, increasing the number of requested connections per second each time. It extracts the significant data from the httperf output, and delivers a CSV or TSV file which can be imported directly into a spreadsheet for analysis or GNUplotted using the included bench2graph script.

Awhttpd 'Anti-Web httpd' is a single-process Web server that relies on its inherent simplicity to be robust and secure. It has support for virtual hosts, CGI, IPv6, and more. In its default mode, though, it is easy to launch and requires no configuration files. It implements the bare minimum of HTTP 1.1 necessary to be a productive web server. It doesn't support certain requests like HEAD (anymore), but normal users will never notice the difference. POST request support is in the works, as is HTTPS/SSL support.

Boa A high-performance Web server for UNIX-like computers

Business Integration Engine BIE is an free software integration system that makes it easy for organizations to exchange data with external trading partners regardless of their native applications. It is truly cross-platform since it written in Java.

Coldstore ColdStore is a gigabyte-scale persistent object store which maps objects into a file (for persistence), can allocate objects in a minimal working-set of pages (for speed), permits library versions to change without a rebuild of the store, and permits application checkpoint/restart. Coldstore might be used to replace a database, cache highly structured objects, act as an OODB, make STL persistent, act as a Document Store for XML/SGML/HTML, create a MUD. Future projects include a virtual machine toolkit, ports of several languages, VW and byte-interpretive language workbench.

Comanche Server Comanche is an extremely simple HTTP (web) server written entirely in Python. It does not use any of the many Python standard library modules related to HTTP serving, as it was initially written as a learning exercise. At present it does not support CGI or SSL and uses a simple fork-on-demand architecture, but is being actively improved.

Ctrlproxy 'ctrlproxy' is an IRC server with multiserver support. It runs as a daemon and connects to a number of IRC servers, then lets you to connect from a workstation and work as the user who is logged in to the IRC server. After you disconnect, it maintains the connection to the server. It acts like any normal IRC server, so you can use any IRC client to connect to it. It supports multiple client connections to one IRC server (under the same nick), so you can connect to IRC using your IRC nick, even if you have an IRC session open somewhere else. It supports logging (in the same format as the irssi IRC client), password authentication, and ctcp (in case no clients are connected).

DNRD DNRD is a proxy DNS Daemon. It is useful for a home network where you have multiple ISPs or VPNs. DNRD can be set up to forward all DNS queries to the appropriate DNS server for each of your ISPs.

DaveDAP DaveDAP is a PHP-based engine to browse, search, and edit an LDAP server over the Web. You can browse your LDAP server in tree mode, or you can search for users based on any number of easily configurable criteria. Users can create and delete objects, edit their contents, and perform searches. DaveDAP aims to be a Web-based replacement for GQ.

Dico GNU Dico is a flexible modular implementation of DICT server (RFC 2229). In contrast to another existing servers, it does not depend on particular database format, instead it handles database accesses using loadable modules. The package includes several loadable modules for interfacing with various database formats, among them a module for dict.org databases and a module for transparently accessing Wikipedia or Wiktionary sites as a dictionary database.

Dolphin dolphin is a lightweight HTTP proxy server. It is multi-threaded, easy to configure, and easy to use.

Dovecot 'Dovecot' is an IMAP server whose major goals are security and extreme reliability. It uses index files to optimally store the mailbox state, which makes it very fast even with huge mailboxes. Indexes won't prevent external mailbox updates, so Dovecot is still fully compatible with standard Maildir and mbox formats. There's also a fully featured POP3 server included.

Duro The goal of the Duro project is to create a library which is as compliant with the proposed database language D as it is possible for a C library. This library is supposed to serve as a basis for a truly relational database management system (TRDBMS).

• Tuples and tables (relvars).
• Relational algebra: RENAME, select (restrict), project, EXTEND, JOIN, SEMIJOIN, UNION, INTERSECT, MINUS, SEMIMINUS, SUMMARIZE PER, DIVIDEBY PER, WRAP, UNWRAP, GROUP, and UNGROUP.
• Virtual tables (views).
• Locking and nested transactions.
• Duro tables are true sets -- uniqueness of tuples (rows) is always enforced. When creating real tables, at least one candidate key must be supplied. A candidate key may be empty.
• User-defined types (including type constraints) and operators.
• Declarative integrity.
• Tcl interface, including support for relational expressions in Tutorial D syntax and operators implemented in Tcl ("stored procedures").
• Simple GUI admin tool.

xs Duro is implemented on top of the Berkeley DB database library.

ENodes ENodes is a reliable web development and publishing framework written in Perl and geared on mod_perl.
Operating like a complete layer on Apache, it allows to manage multiple domains dispatched between multiple webmasters. It includes versioning, access lock, parallel version test, fine granularity of permissions and version management, user workflow, import/export mechanisms and a fully integrate plugin interface.
It is nearly stable and already used by many websites.

Ffproxy ffproxy is a filtering HTTP proxy server that can filter by host, URL, and/or header. Custom header entries can be filtered and added. It can even drop its privileges and optionally chroot() to a directory. It supports logging to syslog() and using another auxiliary proxy server.

Fnord httpd 'fnord' httpd is a small HTTP server (15k static binary). It is fast, and supports sendfile and connection keep-alive, virtual domains, content-ranges, and IPv6. It does transparent content negotiation for special cases (html - html.gz, or gif - png), and has directory index generation.