Apache Tomcat implements the Java Servlet and the JavaServer Pages (JSP) specifications from Oracle, and provides a "pure Java" HTTP web server environment for Java code to run.

qpdfview is a simple tabbed document viewer which uses the Poppler library for PDF rendering and CUPS for printing and provides a clear and simple Qt graphical user interface. Support for the DjVu and PostScript formats can be added via plugins.

Python language bindings for Selenium WebDriver.

A small dumper for media content streamed over the RTMP protocol (like BBC's iPlayer high quality streams). Supplying an RTMP URL will result in a dumped flv file, which can be played/transcoded with standard tools.

GTK+ doesn't have a builtin canvas widget. Goo::Canvas fills that gap. It is easy to use and has powerful and extensible ways to create items in canvases.