TrafficMaker is a packet generator tool that allows you to create custom network packets and send them via any network interface. It can be used to generate junk/malformed random packets, STP, LACP, OAM, and LLDP layer 2 bridging/slow protocol packets, RIPv1, RIPv2, IGMPv1, IGMPv2, OSPF, IS-IS, EIGRP, and HSRP routing packets, SIP and RTP VOIP packets, ICMP, CDP and HSRP Cisco protocol packets, IPv4 TCP packets with various TCP flag options (SYN, ACK, Push, Reset, Urgent, Finish), IPv4 and IPv6 UDP packets, and RADIUS and Kerberos authentication packets. Inline context-specific per-page help is provided.
Simple Packet Sender (SPS) is a Linux packet crafting tool. It supports IPv4, IPv6 including extension headers, and tunneling IPv6 over IPv4. It does not require pcap. It features packet crafting and sending one, multiple, or flooding IPv4 and IPv6 packets of type TCP, ICMP, or UDP (or cycling through all three). All values within an Ethernet frame can be modified arbitrarily. It supports IPv4 header options, TCP header options, and TCP, ICMP, and UDP data as well, input from either a keyboard as UTF-8/ASCII, a keyboard as hexadecimal, or from a file. IPv6 support includes hop-by-hop, "first" and "last" destination, routing, authentication, and encapsulating security payload (ESP) extension headers. For those without access to a native IPv6 network, IPv6 packets can be transmitted over IPv4 (6to4). Packet fragmentation is available for IPv4, IPv6, and 6to4. The assumed maximum transmission unit (MTU) can be changed if unusual fragment sizes are needed. IP addresses and port numbers can be randomized.
LibreNMS is an autodiscovering PHP/MySQL-based network monitoring system forked from Observium. It aims to be easy to use and painless to deploy, and to support monitoring of a wide range of devices. Observium's license changed to a modified QPL license in May 2012, then was split into free and commercial versions. The aim of LibreNMS is to continue to create a usable NMS, but with a community focus and GPL licensing.
Hypersocket is a cross-platform VPN solution built for all types of remote access scenarios. Powerful, yet simple to use, Hypersocket uses a single installed client to provide access to any number of network resources. Its powerful granular access means you can have fine-grained control over your entire network and remote users. Accessed through a secure HTTPS port, the Hypersocket client provides access to any number of host/port combinations, all assigned server-side by the Administrator through roles. The Administrator is able to configure the server through a Web portal on the same HTTPS port.
BGPHist is a tool that receives MP-BGP updates, decodes them, and writes them to a database for logging and monitoring purposes. It supports not only Internet routes, but also IPv4 VPN, IPV6 VPN, and L2VPN. It sounds text output, MySQL databases, and Oracle databases. For the MySQL backend, there is also a simple PHP frontend. It could be used to monitor and log an ISP's customer activity for Internet and VPNs, as a passive BGP looking glass, or as a backend for some external monitoring and accounting system.
ENet for C# wraps the C-language ENet networking library. For games and other realtime applications, if you use TCP, old data can hold up newer data, even if it is no longer relevant (old positions, etc.). Your players will perceive any lost packet as a "lag burst". ENet supports multiple in-order streams of data, and allows you to decide on reliability on a per-packet basis. The library is useful for both client-server and peer-to-peer architectures.