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The Network Time Protocol (NTP) is used to synchronize the time of a computer client or server to another server or reference time source, such as a radio or satellite receiver or modem. It provides client accuracies typically within a millisecond on LANs and up to a few tens of milliseconds on WANs relative to a primary server synchronized to Coordinated Universal Time (UTC) via a Global Positioning Service (GPS) receiver, for example. Typical NTP configurations utilize multiple redundant servers and diverse network paths, in order to achieve high accuracy and reliability. Some configurations include cryptographic authentication to prevent accidental or malicious protocol attacks. See homepage for more infos:

A GObject-based API for handling resource discovery and announcement over SSDP.

GUPnP-AV is a collection of helpers for building AV (audio/video) applications using GUPnP.

GUPnP DLNA is a small utility library that aims to ease the DLNA-related tasks such as media profile guessing, transcoding to a given profile, etc.

This is a library to handle UPnP IGD port mapping.

GUPnP-UI provides a collection of simple GTK+ widgets on top of GUPnP.

GUPnP is an elegant, object-oriented open source framework for creating UPnP devices and control points, written in C using GObject and libsoup. The GUPnP API is intended to be easy to use, efficient and flexible. It provides the same set of features as libupnp, but shields the developer from most of UPnP's internals. GUPnP implements the UPnP specification: resource announcement and discovery, description, control, event notification, and presentation (GUPnP includes basic web server functionality through libsoup). GUPnP does not include helpers for construction or control of specific standardized resources (e.g. MediaServer); this is left for higher level libraries utilizing the GUPnP framework.

KDE Desktop Sharing (krfb) is a small server for the RFB protocol, better known as VNC. Unlike most other Unix/Linux RFB servers, KRfb allows you to share your X11 session instead of creating a new X11 session.

hping is a command-line oriented TCP/IP packet assembler/analyzer. The interface is inspired to the ping(8) Unix command, but hping isn't only able to send ICMP echo requests. It supports TCP, UDP, ICMP and RAW-IP protocols, has a traceroute mode, the ability to send files between a covered channel, and many other features. While hping was mainly used as a security tool in the past, it can be used in many ways by people that don't care about security to test networks and hosts. hping3 adds the TCL scripting feature.

hping is a command-line oriented TCP/IP packet assembler/analyzer. The interface is inspired to the ping(8) Unix command, but hping isn't only able to send ICMP echo requests. It supports TCP, UDP, ICMP and RAW-IP protocols, has a traceroute mode, the ability to send files between a covered channel, and many other features. While hping was mainly used as a security tool in the past, it can be used in many ways by people that don't care about security to test networks and hosts. A subset of the stuff you can do using hping: - Test firewall rules - [spoofed] port scanning - Test net performance using different protocols, packet size, TOS (type of service) and fragmentation. - Path MTU discovery - Files transfering even between really fascist firewall rules. - Traceroute like under different protocols. - Firewalk like usage. - Remote OS fingerprint. - TCP/IP stack auditing.