NXWEB is ultra-fast and super-lightweight web server for applications written in C. It can serve thousands of concurrent requests with a small memory footprint using an event-driven and multi-threaded model that is designed to scale. It features an exceptionally light code base, a simple API, decent HTTP protocol handling, keep-alive connections, SSL support (via GNUTLS), HTTP proxy (with keep-alive connection pooling), non-blocking sendfile support (with configurable small file memory cache), cacheable gzip content encoding, cacheable image thumbnails with watermarks (via ImageMagick), a modular design for developers, and the ability to run as a daemon.
QtWebApp allows you to write standalone Web server applications in C++ as easily as Java Servlets. The HTTP 1.1 server supports persistent connections, sessions with cookies, and file uploads. It contains a template engine and a logger that can be configured at runtime. The application runs on Unix as a daemon, on Windows as a service, and on all operating systems on the command line. It is based on Nokia QT 4.7. Compatibility with QT 4.8 and 5.0 has been verified successfully.
Ocsigen is a research project aiming at developing new programming techniques for the Web. It contains a full featured Web server and a programming framework that provides a way to create dynamic Web sites. Its goal is to offer an alternative to Apache/PHP, based on technologies from research in programming languages. There is also a module, called Eliom, for generating dynamic Web pages. With Eliom, you program in a concise and modular way, with a strong type system which helps you to produce valid XHTML. The server handles sessions, URLs, and page parameters automatically.
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.
HttpdBase4J is an embeddable Java Web server framework that supports HTTP, HTTPS, templated content, and serving content from inside an archive or from the classpath. The classes are easy to extend as they utilize the "don't call us, we'll call you" principle to allow the user to override the framework behavior during all the different phases of the HTTP transaction.
SPServer is a high concurrency C++ server framework library that implements the Half-Sync/Half-Async and the Leader/Follower thread pool patterns. It is based on libevent (Unix/Linux) and IOCP (Win32) in order to utilize the best I/O loop on any platform. It supports SSL for secure transactions. An SSL proxy, sptunnel, is included along with an embedded HTTP server framework, sphttp.