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PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. It combines signaling protocol (SIP) with rich multimedia framework and NAT traversal functionality into high level API that is portable and suitable for almost any type of systems ranging from desktops, embedded systems, to mobile handsets.

UDP-based Data Transfer The UDT software is a C++ library containing the UDT API implementation and programming examples.

uGet is a very powerful download manager application, with large inventory of features but is still very light-weight and low on resources. General features: - Downloads queue - Resume downloads - Advanced download categories - Clipboard monitor - Batch downloads - Multi-protocol - Scheduler

uriparser is an RFC 3986 URI parsing library written in C++.

userfw is extensible packet filter for FreeBSD. Now it's mostly experimental.

VNC stands for Virtual Network Computing. It is, in essence, a remote display system which allows you to view a computing 'desktop' environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures.

vnStat is a console-based network traffic monitor. It keeps a log of hourly, daily and monthly network traffic for the selected interface(s). However, it isn't a packet sniffer. The traffic information is analyzed from the proc(5) filesystem. That way vnStat can be used even without root permissions.

wmlj monitors your Friends List at LiveJournal.com, an online journaling service. It's designed to sit at your WindowMaker dock panel. It checks the Friends List for updates every given time interval, and if some of your friends post new entries, it signals you with a neat graphic animation sequence.

Nepenthes can determine the malware activity on a network by deploying a nepenthes sensor (i.e. honey pot). The programm emulates different well known vulnerabilities waiting for malicious connections trying to exploit them.

Xprobe is a tool automating the X logic. X is a logic developed from the various Active Operating System Fingerprinting methods discovered during the "ICMP Usage In Scanning" research project.