PDFView is a very simple program to view PDF files. on contrast to Preview, the main window will open up maximized, and with the drawer hidden by default. When you toggle the drawer, the main window will resize just enough to show it, and maximize again when you hide it. The zoom level will be as big as possible to make the document fit, making it as easy to read as possible.
StreamMonitor is a plugin for GlowWorm FW that organizes and displays incoming and outgoing socket data in a tcpdump-like format. The interface shows the current offset, the data in both hex and ASCII, the direction of the data (incoming or outgoing), packet size, end point IP addresses and port numbers, and more.
NSFileHandleExt is an Objective-C extension (Cocoa/GNUstep) for the NSFileHandle class (which handles files/sockets). This extension provides support for much easier network programming for protocols like HTTP, IRC, telnet, etc. (everything that sends messages in lines suffixed by \n).