Monkey HTTP Daemon is a very fast and lightweight Web server for Linux. It uses a hybrid networking model based on asynchronous calls (event-driven) and fixed threads, which makes it scalable and capable of attending thousands of clients per second. It provides a powerful API for C and is ideal for embedded devices, thanks to its small core and plugin architecture.
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.
SparForte is a scripting language for large projects requiring reliable, scalable code, reduced maintenance time, and strong bug elimination requirements. It is targeted for programmers interested in quickly writing reliable software, educators wanting to teach disciplined programming skills, and advocates of the Ada/Spark programming languages.
WebBot is a Web development toolset which is designed to sit nicely on top of your existing infrastructure. It is built with a collection of Open Source tools which together enable building Python Web applications the same way native ones are built and running these applications on top of the leading Python frameworks (such as Django and Google's App Engine). As a result, the WebBot framework encourages reuse, concise code, rapid development, and happy developers.
Xidel is a command line tool to download Web pages and extract data from them. It can download files over HTTP/S connections, follow redirections, links, or extracted values, and process local files. The data can be extracted using XPath 2.0, XQuery 1.0, and JSONiq expressions, CSS 3 selectors, and custom, pattern-matching templates that are like an annotated version of the processed page. The extracted values can then be exported as plain text/XML/HTML/JSON, or assigned to variables to be used in other extract expressions or be exported to the shell. There is also an online CGI service for testing.
StatusNet Desktop is a dedicated multi-platform client for connecting to StatusNet messaging servers (requires a server running 0.9.3 or later). The client can connect to multiple StatusNet sites to read and post updates, including secure and private installations. Home, public, individual, and group timelines can be read and posted to, as well as direct user-to-user messages and keyword searching of the public notice stream. Support for StatusNet-specific features such as user groups is explicitly included, where these are usually not supported by generic Twitter-API clients.