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The netpbm-progs package contains a group of scripts for manipulating the graphics files in formats which are supported by the netpbm libraries. For example, netpbm-progs includes the rasttopnm script, which will convert a Sun rasterfile into a portable anymap. Netpbm-progs contains many other scripts for converting from one graphics file format to another. If you need to use these conversion scripts, you should install netpbm-progs. You'll also need to install the netpbm package.
NetSED is small and handful utility designed to alter the contents of packets forwarded through your network in real time. It is really useful for network hackers in following applications: * black-box protocol auditing - whenever there are two or more proprietary boxes communicating over undocumented protocol (by enforcing changes in ongoing transmissions, you will be able to test if tested application is secure), * fuzz-alike experiments, integrity tests - whenever you want to test stability of the application and see how it ensures data integrity, * other common applications - fooling other people, content filtering, etc - choose whatever you want to.
netsniff-ng is a high performance Linux network sniffer for packet inspection. It can be used for protocol analysis, reverse engineering or network debugging. The gain of performance is reached by 'zero-copy' mechanisms, so that the kernel does not need to copy packets from kernelspace to userspace. netsniff-ng toolkit currently consists of the following utilities: * netsniff-ng: the zero-copy sniffer, pcap capturer and replayer itself. * trafgen: a high performance zero-copy network packet generator. * ifpps: a top-like kernel networking and system statistics tool. * curvetun: a lightweight curve25519-based multiuser IP tunnel. * ashunt: an autonomous system trace route and ISP testing utility. * flowtop: a top-like netfilter connection tracking tool. * bpfc: a tiny Berkeley Packet Filter compiler supporting Linux extensions.
Nettle is a cryptographic library that is designed to fit easily in more or less any context: In crypto toolkits for object-oriented languages (C++, Python, Pike, ...), in applications like LSH or GNUPG, or even in kernel space.
Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server. 'Quick and easy' doesn't mean that a resulting application will suffer from a maintainability or a performance issue. Netty has been designed carefully with the experiences earned from the implementation of a lot of protocols such as FTP, SMTP, HTTP, and various binary and text-based legacy protocols. As a result, Netty has succeeded to find a way to achieve ease of development, performance, stability, and flexibility without a compromise.