jQuery-JSONP is a compact (1.6kB minified), yet feature-packed, alternative solution to jQuery's implementation of JSONP. jQuery-JSONP features error recovery in case of network failure or an ill-formed JSON response, precise control over callback naming and how it is transmitted in the URL, multiple requests with the same callback name running concurrently, two caching mechanisms (browser-based and page based), the possibility to manually abort the request just like any other AJAX request, and a timeout mechanism. jQuery-JSONP has been tested and runs within all major browsers.
PHP On Pie is a PHP framework that combines the best ideas from PHP projects like Drupal, CodeIgniter, Kohana, and ZendFramework. It has very few core concepts: classes, models, events, slots, and tools. It lets you repackage completed apps into plugins that you or others can use later. Its smart database classes allow you to implement vertical and horizontal partitioning (sharding) easily to handle millions of users.
hulk is a usable in-browser HTML editor. Running $.hulk with some options will insert a pretty JSON editor into the div with the id "selector". You can then edit the document at your leisure, in text input boxes instead of as JSON. This makes it easy for programmers and non-technical people to collaborate on configuration. Hulk is also smart about detecting your input (if it's large, use a textarea, if it looks like a number, convert it to a number, etc.).
Lingua Server is a fast multi-protocol application service server in Java. Its main features are very fast response times, a pluggable protocol and transport architecture, very easy application service development (MVC), built-in cluster support using multicast, auto-discovery, and distributed shared objects.