phpWebHacks is an advanced HTTP client written in PHP, a utility for HTTP scripting. It simulates a real Web browser, but you use it with lines of code rather than a mouse and keyboard. It uses pure PHP; no Curl or other fancy dependencies are needed. You can build scripts in minutes: a GMail/Yahoo/MSN contacts grabber, a YouTube video downloader, an HTTP mailer, and many more.
Higgs.IO is a high performance, message oriented network library built for realtime systems. It provides a core extensible framework and libraries built on top of the core. Libraries include a WebSocket server, an HTTP server and client, and Boson, a custom serialization and RMI library.
RoboZombie allows easy integration with remote services by allowing you to replicate an endpoint contract and generate a proxy to access it. Contracts can be very flexible in terms of the resources they access. These could be vary from static HTML content or an RRS feed, to a RESTful web service endpoint. Each endpoint contract is specified on a single interface using annotations to provide the communication metadata. It is then wired into your code via an annotation, where it is created, cached, and injected at runtime.