Checky is a document validation and analysis extension for Firefox, Mozilla, and Netscape. It provides an easy-to-use interface to many free and commercial online validation and analysis services. It allows the user to validate, analyze, view, and inspect documents containing HTML, XHTML, CSS, RDF, RSS, XML, P3P, hyperlinks, metadata, and many more. It can check Section 508 and WAI compliance of documents with many helpful services. It can help in the design, development, and maintenance of accessible documents for a semantic web.
The NetBeans Filesystems Library provides The NetBeans Lookup Library as a standalone library that can be used independent of the NetBeans IDE or Platform. The lookup library provides a simple, powerful solution for two problems common to modular applications: Allowing new components to register objects that need to be visible to other elements of the system, and pseudo-multiple inheritance (allowing objects to change the functionality they offer dynamically by changing the contents of their lookup). It is available as a binary download, and JavaDoc is available. NetBeans uses Lookup internally to allow plugin modules to install new objects such as compilers that need to be found by the common infrastructure that supports them. However, the library can be useful in almost any situation in which loose coupling is desirable. It includes an AbstractLookup class and a number of other implementations of the Lookup interface that make it very easy to quickly get started.