NanoHttpd is a lightweight HTTP server designed for embedding in other applications. It's only one Java file, in two "flavors", one strictly Java 1.1 compatible, and one at "current" standards. It supports GET, POST, PUT, HEAD and DELETE requests, and supports file uploading with very small memory overhead. Temp file usage and the threading model are easily customized.
Ashd is an HTTP server that follows standard Unix philosophy for modularity. Instead of being a monolithic program with loadable modules, as most other HTTP servers seem to be, Ashd is simply a collection of much simpler programs, passing HTTP requests to each other using a simple protocol. The model also allows such handler programs to persist properly, so that, for example, session data can be kept in memory, connections to back-end services can be kept open, and so on.
GNU libmicrohttpd is a small C library for embedding HTTP server functionality into other applications. It is reentrant, fast, supports HTTP 1.1, and permits listening on multiple ports. The API is simple and still powerful enough to allow programmers to use the entire HTTP feature set. SSL/TLS support is available as an option.
Tntnet is a Web application server for generating Web applications in C++. HTML pages with some additional tags for inclusion of C++ code are compiled into shared libraries and served from tntnet. It resembles PHP, JSP, or Mason, but the programming language used is C++, and the pages are compiled into native code before serving. Tntnet is fully multithreaded and supports HTTP keep-alive for best performance. Its dynamic pages are faster than static pages with other Web servers, while creating Web applications is simple.
phpSecurePages is a PHP module to secure pages with a login name and password. It can handle multiple user groups (each with their own viewing rights), store data in a MySQL database or a configuration file, and be used to identify your Web site viewers. It also has multiple language support and optional IP-based access restrictions.
Wt is a C++ library for developing Web applications with an API that is widget-centric and inspired by existing C++ graphical user interface APIs. To the developer, it offers abstraction of Web-specific implementation details, increasing the accessibility and portability. Under the hood, the library uses the latest techniques (HTML5, Ajax, WebSockets) to handle user events and update the Web page.
Stunnix Advanced Web Server is a Web server for putting Web sites onto CD-ROMs, DVDs, FlashDisks, and other readonly media to be used on any typical system. Sites can be scripted with PHP, Python, Java, or Perl and can be driven by MySQL or SQLite databases. All required software programs are designed to reside on the CD-ROM to avoid the need to install software on the user's computer. The Web serving core is based on Apache 1.3.x, and has additional functionality to detect and use free ports and automatically start a browser on each platform. Desktop applications can also be created with it.