4PSA VoipNow is PBX software for service providers and enterprises. Easy to use and deploy, it can run on x86 or PowerPC based servers and delivers advanced IP telephony services. It can be deployed in various working scenarios to provide hosted VoIP services in high availability xSP environments, advanced call center services, or enterprise telephony in organizations of all sizes. A free Express version is available.
4store is an efficient, scalable, and stable RDF database. It was developed to underpin Semantic Web applications. It has been providing a base platform for these applications for around 3 years. It has successfully held and run queries over databases of 15GT, supporting a Web application used by hundreds of thousands of people.
4tH is a Forth compiler with a little difference. Instead of the standard Forth engine it features a conventional compiler. 4tH is a very small compiler that can create bytecode, C-embeddable bytecode, standalone executables, but also works fine as a scripting language. It supports about 95% of the ANS Forth CORE wordset and features conditional compilation, pipes, files, assertions, forward declarations, enumerations, structures, suspended execution, recursion, include files, etc. It comes with an RPN calculator, line editor, preprocessor, compiler, decompiler, C-source generator, a virtual machine, and a multitasking environment.
6's Keen TV Listings Scanner is a program that accepts a list of your favourite TV shows, movies, actors, and actresses, and running from crontab, performs a daily search for them in gist.com's TV listings search engine, and emails you a summary of the results. You get a daily email listing 15-20 programs that you'd probably like to watch, and, of course, gist.com lets you exclude channels that you cannot access.
6's Spiffy AudioGalaxy Query Tool is a package that automates queries to the AudioGalaxy music sharing system. It enables you to queue any song (at a minimum configurable bitrate) with one command line, even if the AudioGalaxy site is busy or unresponsive. It will also allow you to queue most full albums with one command line, by going on AllMusic.Com to look up the song list, and queueing up each of the songs listed.
6jack is a framework for testing, analyzing, and fuzzing network applications. 6jack runs a command, intercepts calls to common network-related system calls, and passes them through an external filter. A filter can be written in any language supporting the MessagePack serialization library. 6jack is especially useful for writing tests for clients and servers, debugging and reverse engineering protocols, sketching filtering proxies, and fuzzing.